Carnegie - Cal Tech Expedition Collection, 1937-1996.

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Carnegie - Cal Tech Expedition Collection, 1937-1996.

NAU.MS.293
NAU.PH.94.27


Descriptive Summary
Creator:	Sharp, Robert P.
Collection Name	Carnegie - Cal Tech Expedition Collection,
Inclusive Dates:	October 1937 - November 1937.
Physical Description	.5 linear feet
Abstract	The Carnegie - Cal Tech Expedition Collection consists of materials relating to the geological research expedition conducted in 1937 by scientists from the Carnegie Institute of Washington and the California Institute of Technology, led by Ian Campbell of Cal Tech. Robert Sharp's geological field notes taken over the course of the expedition, John Stark's A Doggerel Log of a Canyon Trip and Edwin McKee's report and historical note to the U.S. Department of the Interior make up this small collection.
Collection number	NAU.MS.293 NAU.PH.94.27
Language	English.
Repository	Cline Library. Special Collections and Archives Department. Northern Arizona University Box 6022 Flagstaff, AZ 86011-6022 Phone: 928 523 5551 Fax: 928 523 3770 Email: Special.Collections@nau.edu

Biographical Note

Robert Phillip Sharp was born on June 24, 1911, in Oxnard, California. He is the firstborn son of Julian and Alice Sharp. He spent his childhood in Oxnard, then a small farming community of about 5,000 people.

Sharp was admitted to the California Institute of Technology in 1930. His original intention was to become an engineer. However, during his sophomore year he became fascinated with geology after taking a required course in that field. Having discovered what would be his life's work, he completed his undergraduate studies in geology at Cal Tech in 1934. After spending a year as a graduate student at Cal Tech, Sharp was accepted at Harvard University, and went on to earn his Ph.D. in geology in 1938.

During 1937, his final year at Harvard, Sharp was the youngest member of a geological research expedition to the Grand Canyon of scholars from the Carnegie Institute of Washington and the California Institute of Technology. This expedition was organized and led by Dr. Ian Campbell, a Cal Tech geologist who was acquainted with Sharp. It was Campbell who suggested that Sharp be invited to join the expedition. Harvard University agreed to allow Sharp a traveling fellowship for this purpose.

During the two-month boat trip down the Colorado River, Sharp took copious notes on the geology of the Grand Canyon. Using this research material, he later published two papers about Precambrian unconformities. Another field notebook, which Sharp created at Campbell's request, is titled "On Archean Rocks."

Robert Sharp's published materials regarding the geology of the Grand Canyon include the following: "A Cambrian slide breccia, Grand Canyon, Arizona." American Journal Science, 1940, 238.688-672; "Ep-Archean and Ep-Algonkian erosion surfaces, Grand Canyon, Arizona." Geoeological Society America Bulletin, 1940, 51:1235-1270.

After completing his doctorate, Sharp served in the U.S. Air Force from 1943 through 1946. Shortly after his military service, he was employed as a professor of geology at Cal Tech, a position he retained until 1978. At the date of this note he resides in California with his wife, Jean. He has referred to the 1937 Grand Canyon expedition as the best trip of his life.

Scope and Content Note

The seeds for the 1937 Carnegie-Cal Tech trip were initially planted by vertebrate paleontologist John Campbell Merriam, Director of the Carnegie Institute of Washington, who recognized a need for a systematic study of the geology of the Grand Canyon. He had selected several different geologists to examine different aspects of the Canyon: to Edwin McKee, the Park Naturalist of Grand Canyon, went Paleozoic rocks. Norman Ethan Allen Hinds, a professor at the University of California-Berkeley (where Merriam was once a faculty member), was assigned the older pre-Paleozoic. Finally, to Ian Campbell and John Maxson of the California Institute of Technology went the responsibility of the igneous and metamorphic rocks that compose the inner gorges of the Grand Canyon.

To this end Ian Campbell organized the river trip, it being quite difficult to study the rocks of the inner gorge in any other fashion. In addition to Maxson, he added Robert P. Sharp, who was working on his Ph.D. thesis at Harvard University; John T. "Jack" Stark of Northwestern University, and Edwin McKee, who joined the trip at the Bass Trail. The three boatmen were Frank B. Dodge, rowing the Fairchild, Owen R. Clark in the Collier, and Merril Spencer at the oars of the Eliel.

The trip launched on October 11, 1937 at Lees Ferry, taking out at Pierces Ferry on November 25, covering a distance of some 280 river miles. Sharp recorded his findings in detail in both written and photographic format. The photographs in the three albums are referenced in his three field notebooks, which are housed in the Carnegie-Cal Tech Manuscript collection.

The Carnegie-Cal Tech trip is perhaps best known as the trip which was passed by Haldane "Buzz" Holmstrom on his remarkable solo voyage through the Grand Canyon. Also of note is that the Carnegie-Cal Tech group was the last to see two of the largest and most intimidating rapids on the Colorado: Separation and Lava Cliff. By the next year, both had been drowned out by the rising waters of Lake Mead.

Organization

Organized into three series.

I. Original journals and original copy of the "Doggerell Log.
II. Transcriptions of journals and an article about the trip.
III. Photographs.

Restrictions

None.

Copyright

It is the responsibility of the user to obtain permission to publish from the owner of the copyright (the institution, the creator of the record, the author or his/her transferees, heirs, legates, or literary executors). The user agrees to indemnify and hold harmless the Arizona Board of Regents for Northern Arizona University, its officers, employees, and agents from and against all claims made by any person asserting that he or she is an owner of copyright.

Related Material

Carnegie Cal - Tech photograph collection, NAU.PH.94.27.1-240.

Grand Canyon River Guides Oral History Collection 53, interview 23.

Barbara and Eddie McKee photograph collection, NAU.PH.95.48.1-560.

Norm and Doris Nevills collection, [photographs] NAU.PH.99.6

Georgie Clark collection, [manuscript] NAU.MS.270

Plez Talmadge Reilly collection, [manuscript] NAU.MS.275

Bill Belknap [photographs] NAU.PH.96.4

USGS Old Timers' [photographs] NAU.PH.94.37

Bill Belknap collection, [manuscript] NAU.MS.288

Martin J. Anderson Collection, [manuscript] NAU.MS.77

Grand Canyon River Guides records, [manuscript] NAU.MS.247

Emery Kolb papers, 1905-1976 [manuscript] NAU.MS.197

Edith Kolb Lehnert papers, 1920s [manuscript] NAU.MS.222

Grand Canyon River Guides Oral History Collection, NAU.MS.OH.57

Access Points

Personal Name(s)

Campbell, Ian, 1899-1978.

Clark, Owen.

Dodge, Frank B.

Maxson, John H.

Merriam, John C. (John Campbell), 1869-1945.

Spencer, Merrill F.

Stark, J. T. (John Thomas), b. 1888.

Hinds, Norman E. A. (Norman Ethan Allen), 1892-

McKee, Edwin Dinwiddie, 1906-

Sharp, Robert P. (Robert Phillip)--Archives.

Corporate Name(s)

Carnegie Institution of Washington.

California Institute of Technology.

Geographic Name(s)

Colorado River (Colo.-Mexico)--Discovery and exploration.

Grand Canyon (Ariz.)--Discovery and exploration.

Subject(s)

Boats and boating--Colorado River (Colo.-Mexico)

Geological surveys--Arizona--Grand Canyon.

Geologists.

Genre Form(s)

Journals (accounts)

Administrative Information

Credit Line

Carnegie - Cal Tech Expedition Collection, NAU.MS.293 and NAU.PH.94.27, Cline Library. Special Collections and Archives Dept.

Container List


Series one, box 1, Original journals, notes and "Doggerell Log," , October 1937 - November 1937.


Box-folder
1.1			"Notes on Archean Rocks," , 1937.
Box-folder
1.2			Sharp - Diary #1, Carnegie Institute - Cal Tech Grand Canyon Expedition, 1937.
Box-folder
1.3			Sharp - Diary #2, Carnegie Institute - Cal Tech Grand Canyon Expedition, 1937.
Box-folder
1.4			Jack Stark - "The Doggerel Log of a Canyon Trip," handwritten, illustrated, and bound epic poem of the expedition, 1937.


Series two, box 2, transcriptions of Sharp's diaries, color copy of the "Doggerell Log, and the McKee report, 1937-1996.


Box-folder
2.5			Transcription of Sharp's "Notes on Archean Rocks," by Earle E. Spamer, 1996.
Box-folder
2.6			Photocopy of Sharp's "Notes on Archean Rocks," , 1937.
Box-folder
2.7			Transcription of Sharp's Diary #1, by Earle E. Spamer, 1996.
Box-folder
2.8			Photocopy of Sharp's Diary #1, 1937.
Box-folder
2.9			Transcription of Sharp's Diary #2, by Earle E. Spamer, 1996.
Box-folder
2.10			Photocopy of Sharp's Diary #2, 1937.
Box-folder
2.11			Photocopy of Jack Stark's "The Doggerel Log of a Canyon Trip," , 1937.
Box-folder
2.12			McKee - "Report on the Carnegie Institution - California Institute of Technology Expedition down the Colorado River through Grand Canyon" and attached "Historical Notes" submitted to the U.S. Department of the Interior, by Edwin McKee, 1937.
Box-folder
2.13			Manila envelope, addressed to Sharp from Stark, postmarked Tahiti and Paris, 1939.


Series three, Photographs, NAU.PH.94.27, 1937.
	1 photo album containing photographs taken during the 1937 Carnegie-Cal Tech river trip through the Grand Canyon of the Colorado, plus a number of loose prints. 240 black-and-white photographs; 169 black-and-white negatives.
	The primary purpose of the photographs was to document geologic features of the Grand Canyon of the Colorado River; there are also a large number of images of the geologists, boatmen, rapids, and boats. Several images portray Buzz Holmstrom. For additional details on the photographs, see Dr. Sharp's field notebooks, which include identification, roll number, and exposures.
	Digital versions of these images are available here.

		NAU.PH.94.27.1: At the edge of the Grand Canyon with the good Ship Eliel., Grand Canyon (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.2: Approoching Lees Ferry with the Eliel., Grand Canyon (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.3: Pedestal Rock near Lees Ferry, Lees Ferry (Ariz.), Grand Canyon (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.4: Stuck in the Paria River near Lees Ferry., Grand Canyon (Ariz.), Lees Ferry (Ariz.), Paria River (Utah and Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.5: Lauching a boat at Lees Ferry., Lees Ferry (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.6: Lauching a boat at Lees Ferry., Lees Ferry (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.7: Lees Ferry, Grand Canyon (Ariz), Lees Ferry (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.8: Mass of Coconino standing on end, Marble Canyon., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.9: Lauching the Eliel at Lees Ferry., Lees Ferry (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.10: Just before shoving off from Lees Ferry, Oct. 11., Lees Ferry (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 11, 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.11: Portaging a boat around Soap Creek Rapids with block and tackle, Lunch Hour, Grand Canyon (Ariz.) Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.12: Navajo Bridge at head of Marble Canyon, six miles below Lees Ferry., Grand Canyon (Ariz.), Navajo Bridge (Ariz.). Sharp, Robert P., Oct. 11, 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.13: Head of Soap Creek Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.14: Dodge and Campbell below House Rock Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.15: Three boats in Marble Canyon. Coconino, Hermit, and Supai exposed in walls., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.16: Kaibab, Coconino, Hermit, and Supai in Marble Canyon, near 21-22 mile point., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.17: Slump terrace in silt at river's edge, 22 Mile Rapids., Grand Canyon (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.18: Spencer in 25 Mile Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.19: End of portage at foot of Badger Creek Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.20: Stream fluting on boulder of Redwall limestone near 27 Mile Rapids., Grand Canyon (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.21: Frank Dodge shooting The North Canyon Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 13x18.
		NAU.PH.94.27.22: Merril Spencer in the North Canyon Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 13x18.
		NAU.PH.94.27.23: Redwall limestone and overlying formations in Marble Canyon above 29 Mile Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.24: Vasey's Paradise in Marble Canyon., Arizona, Coconino, Grand Canyon. Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.25: Vertical cliff at Redwall limestone in Marble Canyon near Vasey's Paradise., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 8x5.
		NAU.PH.94.27.26: Stream fluted surface on Muav limestone., Arizona, Coconino, Grand Canyon. Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.27: Merril Spencer, on the aft hatch of the Eliel., Arizona, Coconino, Grand Canyon. Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 8x5.
		NAU.PH.94.27.28: The Chasm of Marble Gorge., Arizona, Coconino, Grand Canyon. Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 8x5.
		NAU.PH.94.27.29: A boat disappears at Granite Falls., Arizona, Coconino, Grand Canyon. Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.30: Beaver tracks and dragway opposite mouth of Deer Falls Creek., Arizona, Coconino, Grand Canyon. Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.31: Looking downstream from 25 mile point in Marble Canyon, Bright Angel, Muav, Redwall, etc., Arizona, Coconino, Grand Canyon. Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.32: Butte Fault in Kwagunt Basin note upturned beds., Grand Canyon (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.33: Nankoweap Basin., Arizona, Coconino, Grand Canyon. Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.34: Nankoweap Basin., Grand Canyon (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.35: Jack Stark in his life preserver., Arizona, Coconino, Grand Canyon. Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.36: Miniature Grand Canyons cut in soft silt by ground water at edge of river., Arizona, Coconino, Grand Canyon. Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.37: Cemented and dissected slope-wash breccia below 60 Mile Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.38: Unconformity between Tapeats and Algonkian sediments two miles below mouth of Little Colorado., Arizona, Coconino, Grand Canyon. Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.39: Tapeats sandstone (Middle Cambrian) about two miles below mouth of Little Colorado., Grand Canyon (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 13x18.
		NAU.PH.94.27.40: Chuar sediments in Lava Creek Basin., Arizona, Coconino, Grand Canyon. Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.41: Butte fault as seen in Lava Creek Basin at Carbon Creek., Arizona, Coconino, Grand Canyon. Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.42: Wind ripples with smaller water ripples superposed below Lava Creek., Arizona, Coconino, Grand Canyon. Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.43: Algonkian Dox formation below Lava Creek, peak is topped with Algonkian lava., Arizona, Coconino, Grand Canyon. Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.44: Normal faults in Algonkian, Tanner Rapids., Arizona, Coconino, Grand Canyon. Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.45: "Diabase" dike in Hakatai shale at head of Hance Rapids., Grand Canyon (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.46: Looking downstream below Hance Rapids, Archean-Algonkian unconformity., Arizona, Coconino, Grand Canyon. Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.47: Hotatua conglomerates at foot of Hance Rapids., Arizona, Coconino, Grand Canyon. Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.48: Looking upstream toward Hance Rapids from mouth of asbestos mine tunnel, Archean-Algonkian unconformity., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.49: Sockdolager Rapids., Arizona, Coconino, Grand Canyon. Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.50: Vishnu schist in Vishnu Canyon., Grand Canyon (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.51: Fold, schistosity, fracture cleavage, and bedding in schist just below Vishnu Creek., Grand Canyon (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.52: "Organ Pipe" flutes foot of Grapevine Rapids., Arizona, Coconino, Grand Canyon. Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.53: Owen Clark start down the 83 Mile Rapids., Arizona, Coconino, Grand Canyon. Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.54: Tapeats resting on Archeon complex downstream from Lone Tree and Clear Creeks., Grand Canyon (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.55: Minor fold in Lone Tree Canyon in schists. Shows bedding, drag folds, and schistosity relations., Grand Canyon (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.56: Zoroaster Temple as seen from the mouth of Lone Tree Canyon., Grand Canyon (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 12x18.
		NAU.PH.94.27.57: Owen Clark in Zoroaster Rapids., Grand Canyon (Ariz.) Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 12x18.
		NAU.PH.94.27.58: Camp half mile above Clear Creek as seen from south side., Grand Canyon (Ariz.) Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.59: Banded quartzite and schist near Clear Creek., Grand Canyon (Ariz.) Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.60: Suspension bridge at Bright Angel, Grand Canyon National Park., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.61: Tapeats on Archean near Bright Angel as seen from Yaki trail. looking North., Grand Canyon (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.62: Looking downstream from the Yaki trail, Grand Canyon., Grand Canyon (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.63: Looking northwest from Yaki trail in Supai, Grand Canyon., Grand Canyon (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.64: Looking north from Yaki trail, in Coconino., Grand Canyon (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.65: Mules with our supplies at Bright Angel., Grand Canyon (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.66: Tapeats-Archean contact on Garden Creek, shows disintegrated zone in Archean., Grand Canyon (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.67: Looking toward mouth of Pipe Creek from trail. Shows drag in Algonkian sediments along Bright Angel fault., Grand Canyon (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.68: Cactus Jack at play., Grand Canyon (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.69: Basal Tapeats on Archean and overlying breccia zone, 91 Mile Creek., Grand Canyon (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.70: Slide breccia at Tapeats-Archean contact 91 Mile Creek., Grand Canyon (Ariz). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.71: Stream fluted limestone boulder opposite Trinity Creek., Grand Canyon (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.72: Tapeats on Archean as seen half a mile above Salt Creek on north side., Grand Canyon (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.73: Bailing the boats after shooting Monument Creek Rapids., Grand Canyon (Ariz.) Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.74: Stream fluted boulder delta of Hermit Creek., Grand Canyon (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.75: Frank Dodge in Hermit Creek Rapids, Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.76: Looking downstream toward Boucher Creek Upper Granite Gorge., Grand Canyon (Ariz.) Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.77: Decomposed granite with boulders of weathering. Tapeats-Archean contact about 96 Mile Point., Grand Canyon (Ariz.). Sharp, Robert P., 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.78: Stream fluted boulders 119 Mile Creek., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.79: Merril Spencer in Forster Creek Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.80: Tapeats-Archean contact, Middle Granite Creek, below 127 Mile Creek., Grand Canyon (Ariz.) Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.81: Archean-Tapeats contact, Middle Granite Gorge one mile below 127 Mile Rapids., Grand Canyon (Ariz.) Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.82: Tapeats-Hakatai unconformity Crystal Creek., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.83: Looking up Crystal Creek, Algonkian and Paleozoics., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.84: Owen Clark in Sapphire Creek Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.85: Owen Clark in the Ruby Canyon Dam Site Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.86: Shinumo monadnock on the north side of Shinumo Creek., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.87: Normal faults in Algonkian on Shinumo Creek., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.88: Warming up after lining the Walthenberg Rapids., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.89: Cactus Jack and Frank Dodge on the Fairchild below Elvis Chasm., Grand Canyon (Ariz.) Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.90: Frank Dodge in Specter Rapids., Grand Canyon (Ariz.) Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.91: Travertine on Hakatai on west side of Tapeats Creek., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.92: Falls on Thunder River., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.93: Falls on Thunder River., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.94: Frank Dodge shooting the Serpentine Creek Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 12x18.
		NAU.PH.94.27.95: Falls on Thunder River., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.96: Shinumo monadnock on east side of Tapeats Creek projecting to within 100 ft. of lower "snuff" dolomite., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.97: Tapeats--Shinumo--Hakatai contact on east side of Tapeats Creek, shows slope of deposition of Tapeats., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.98: Algonkian-Archean contact at head of Granite Narrows., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.99: Looking downstream toward Granite Narrows, shows Algonkian resting on Archean complex., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.100: Tapeats overlap on Archean monadnock, Deer Creek., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.101: Deer Creek Falls., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.102: Owen Clark in Fishtail Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.103: Concave and convex mud cracks at edge of Kanals Creek., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.104: J. H. Maxson climbing around a rapids., Grand Canyon (Ariz.) Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.105: Luncheon stop, and general discussion., Grand Canyon (Ariz.) Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.106: Jack Stark in his boudoir., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.107: Frank Dodge in Fishtail Rapids., Grand Canyon (Ariz.) Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.108: Merril Spencer in Fishtail Rapids., Grand Canyon (Ariz.) Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.109: Lunch below Matkatakmiba Rapids., Grand Canyon (Ariz.) Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.110: Looking straight up out of the canyon., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.111: Looking upstream toward Fern Glen Creek, shows middle and upper Muav and Devonian below Redwall., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.112: Boatmen discussing ways and means through Havasupai Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.113: Looking straight up out of the canyon., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 8x5.
		NAU.PH.94.27.114: Looking downstream from east side of Gateway Canyon., Grand Canyon (Ariz.) Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 8x5.
		NAU.PH.94.27.115: Lower Paleozoic beds on the north side opposite Gateway Canyon., Grand Canyon (Ariz.) Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 8x5.
		NAU.PH.94.27.116: Quaternary lavas on north side looking downstream from Lava Falls., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.117: Cactus Jack, the Rykrysp King., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.118: Cactus Jack, the Rykrysp King., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.119: Portaging the Eliel around Lava Falls Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.120: Three boats approaching rapids atr 212 Mile Point., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.121: Owen Clark in 212 Mile Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.122: Merril Spencer in 212 Mile Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.123: Frank Dodge in 217 Mile Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.124: Merril Spencer in 212 Mile Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.125: Lower Granite Gorge, looking upstream toward 217 Mile Point., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.126: Merril Spencer in 224 Mile Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.127: Ripples in sand at 222 Mile Point., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.128: Ripples in sand at 222 Mile Rapids., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.129: Frank Dodge sans chapeau at Travertine Rapids., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.130: Buzz Holmstrom as he arrived at Diamond Creek, Nov. 20., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 20, 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.131: Frank Dodge and Buzz Holmstrom look over Buzz's boat., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.132: Frank Dodge and Buzz Holmstrom, lone Colorado River voyager, inspect Buzz's boat., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.133: Buzz Holmstrom in Diamond Creek Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.134: Buzz and the gang inspect the greeting board we left in Granite Park., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.135: Buzz Holmstrom arrives at Diamond Creek., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 6x8.
		NAU.PH.94.27.136: Frank Dodge and Buzz Holmstrom, mouth of Diamond Creek., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 6x8.
		NAU.PH.94.27.137: Buzz and Frank Dodge inspect Holmstrom's boat., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 6x8.
		NAU.PH.94.27.138: Frank Dodge and Buzz in conference., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 6x8.
		NAU.PH.94.27.139: J. T. Stark, as he usually was., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 6x8.
		NAU.PH.94.27.140: Lunch stop above Parashont Wash., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 6x8.
		NAU.PH.94.27.141: Buzz Homstrom watches some mapwork at foot of Travertine Rapids, Ian Campbell and Johnny Maxson at the table., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 6x8.
		NAU.PH.94.27.142: Boatmen inspect Lava Cliff Rapids., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 6x8.
		NAU.PH.94.27.143: Buzz leaves on Sunday, Nov. 21 at foot of Travertine Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 21, 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.144: Pegmatiters in Archean near mouth of Gneiss Canyon., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.145: Garnets in mica schist at foot of Travertine Rapids., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.146: Pegmatites in migmatites at foot of 234 Mile Rapids., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.147: Pot holes in granite at foot of 234 Mile Rapids., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.148: Pot holes in granite at 238 Mile Point., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.149: Middle Granite Gorge downstream from 238 Mile Point, shows Tapeats, Bright Angel, and lower Paleozoic., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.150: Memorial plaque at head of Separation Rapids placed by Fraiser-Eddy 1934 Expedition., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.151: Owen Clark does a tail spin in Gneiss Creek Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 13x18.
		NAU.PH.94.27.152: Frank Dodge in rapids at 232.5 Mile Point., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 13x18.
		NAU.PH.94.27.153: Three boats near bottom of Separation Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.154: Three boats tied up for bailing foot of 241 Mile Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.155: Buzz Holmstrom's sign at head of Lava Cliff Falls., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.156: Frank Dodge starting down Lava Cliff Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.157: Owen Clark starting down Lava Cliff Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.158: Mud cracks in Lake Mead mud near Reference Point Canyon., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.159: Mud cracks in Lake Mead mud, Reference Point Canyon., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.160: Mud cracks in Lake Mead mud at Reference Point Canyon., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.161: Mud cracks in Lake Mead mud, Reference Point Canyon., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.162: Tapeats on Archean granite, Reference Point Creek., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.163: Paleozoics on Archean granite along Lake Mead., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.164: Tapeats on Archean granite 259.5 Mile Point., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.165: Tapeats on Archean granite, 260 Mile Point., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.166: Lunch at 260 Mile Point on Lake Mead., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.167: The Apache picks us up at 264.5 Mile Point for a tow to Pierce's Ferry, Lake Mead., Lake Mead (Ariz. and Nev.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.168: The Eliel adn Fairchild being towed down Lake Mead behind the Collier., Lake Mead (Ariz. and Nev.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.169: The Eliel and Fairchild being towed behind the Collier., Lake Mead (Ariz. and Nev.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.170: The Apache at Pierce's Ferry, Lake Mead, 80 miles up lake from Boulder Dam., Lake Mead (Ariz. and Nev.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.171: Frank Dodge posing as the thinker., Grand Canyon (Ariz.). Sharp, Robert P., 1937. Black-and-White Photograph, 8x6.
		NAU.PH.94.27.172: Owen Clark, cook and skipper of the Collier., Grand Canyon (Ariz.). Sharp, Robert P., 1937. Black-and-White Photograph, 8x6.
		NAU.PH.94.27.173: Breaking the last camp at Lees Ferry., Grand Canyon (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 8x6.
		NAU.PH.94.27.174: Drying off after shooting Upset Rapids., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 8x6.
		NAU.PH.94.27.175: The end of our trip, Pierce's Ferry, Lake Mead., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 8x6.
		NAU.PH.94.27.176: Grand Wash Cliffs and an arm of Lake Mead, near Pierce's Ferry., Lake Mead (Ariz. and Nev.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 8x6.
		NAU.PH.94.27.177: The boats tied up at Pierce's Ferry., Lake Mead (Ariz. and Nev.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 8x6.
		NAU.PH.94.27.178: A set up with the radio at the South Rim., Grand Canyon (Ariz.). Sharp, Robert P., 1937. Black-and-White Photograph, 8x6.
		NAU.PH.94.27.179: Adios to Arizona and its cactus., . Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 8x6.
		NAU.PH.94.27.180: Grand Canyon from Moran Point., Grand Canyon (Ariz.). Sharp, Robert P., 1937. Black-and-White Photograph, 8x6.
		NAU.PH.94.27.181: #3-5 Pot holes in process of formation, 25 Mile Rapids., Grand Canyon (Ariz.). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.182: "Diabase" dike in Hakatai shale at head of Hance Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, .
		NAU.PH.94.27.183: "Diabase" dike in Hakatai shale at head of Hance Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Oct. 1937. Black-and-White Photograph, .
		NAU.PH.94.27.184: Owen Clark in Sapphire Creek Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, .
		NAU.PH.94.27.185: Merril Spencer in small rapids half mile below Walthenberg Creek., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 6x8.
		NAU.PH.94.27.186: Tapeats Archean contact--117.5 Mile Point., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.187: Stream fluted boulders--119 Mile Creek., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.188: Merril Spencer--Forster Creek Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Negative, .
		NAU.PH.94.27.189: Small Monadnock in Archean one half mile below 127 Mile Rapids., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Negative, .
		NAU.PH.94.27.190: Archean-Tapeats contact (surface) looking downstream one mile below 127 Mile Rapids., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Negative, .
		NAU.PH.94.27.191: Owen Clark--Specter Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.192: Columnar jointing in lavas on north side below Lava Falls., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Negative, .
		NAU.PH.94.27.193: Columnar jointing in lavas on north side below Lava Falls., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Negative, .
		NAU.PH.94.27.194: Looking upstream toward lavas on north side near 182 Mile Point., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Negative, .
		NAU.PH.94.27.195: Lava pouring down a side canyon near Mile 185.5., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Negative, .
		NAU.PH.94.27.196: Lunch at 196 Mile Point., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 17, 1937. Black-and-White Negative, .
		NAU.PH.94.27.197: Three boatmen discuss 205 Mile Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Sharp, Robert P., Nov. 1937. Black-and-White Negative, .
		NAU.PH.94.27.198: Looking north form Granite Park--shows a slide and lower Paleozoic unit., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Negative, .
		NAU.PH.94.27.199: Myself [Robert P. Sharp] on Muav Cliff., Grand Canyon (Ariz.). Sharp, Robert P., Nov. 1937. Black-and-White Negative, .
		NAU.PH.94.27.200: Cactus Jack., Grand Canyon (Ariz.). Sharp, Robert P., 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.201: Ripple marks in windblown sand., Grand Canyon (Ariz.). Sharp, Robert P., 1937. Black-and-White Photograph, 8x5.
		NAU.PH.94.27.202: Ripple marks in windblown sand., Grand Canyon (Ariz.). Sharp, Robert P., 1937. Black-and-White Photograph, 5x8.
		NAU.PH.94.27.203: Preparing dinner at Travertine Canyon [Owen Clark]., Grand Canyon (Ariz.). McKee, Edwin, Nov. 1937. Black-and-White Photograph, 8x6.
		NAU.PH.94.27.204: Dodge and Stark on boat Stephens Aisle., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). McKee, Edwin, 1937. Black-and-White Photograph, 6x8.
		NAU.PH.94.27.205: Grand Canyon, Grand Canyon (Ariz.). Unidentified, 1937. Black-and-White Photograph, 6x8.
		NAU.PH.94.27.206: Grand Canyon., Grand Canyon (Ariz.). Unidentified, 1937. Black-and-White Photograph, 6x8.
		NAU.PH.94.27.207: [Grand Canyon] These are very poor prints. They are the only duplicates we have. Come and see us and we will show you some good pictures., Grand Canyon (Ariz.). Unidentified, 1937. Black-and-White Photograph, 8x6.
		NAU.PH.94.27.208: Sedimentary beds of the Grand Canyon. Note alcove., Grand Canyon (Ariz.). Unidentified, 1937. Black-and-White Photograph, 6x8.
		NAU.PH.94.27.209: [Grand Canyon], Grand Canyon (Ariz.). Unidentified, 1937. Black-and-White Photograph, 8x6.
		NAU.PH.94.27.210: Mount Sinyala, Havasu [Grand Canyon], Grand Canyon (Ariz.). Unidentified, 1937. Black-and-White Photograph, 6x8.
		NAU.PH.94.27.211: A-7 Lees Ferry., Lees Ferry (Ariz.), Colorado River (Colo.-Mexico). Campbell, Ian, Oct. 11, 1937. Black-and-White Photograph, 8x12.
		NAU.PH.94.27.212: Loading boats at Lees Ferry., Lees Ferry (Ariz.), Colorado River (Colo.-Mexico). Campbell, Ian, Oct. 11, 1937. Black-and-White Photograph, 8x12.
		NAU.PH.94.27.213: Start from Lees Ferry., Lees Ferry (Ariz.), Colorado River (Colo.-Mexico). Campbell, Ian, Oct. 11, 1937. Black-and-White Photograph, 8x12.
		NAU.PH.94.27.214: Navajo Bridge ., Navajo Bridge (Ariz.), Colorado River (Colo.-Mexico). Campbell, Ian, Oct. 11, 1937. Black-and-White Photograph, 8x12.
		NAU.PH.94.27.215: Portage Badger Rapids, Grand Canyon (Ariz.). Campbell, Ian, Oct. 11, 1937. Black-and-White Photograph, 8x12.
		NAU.PH.94.27.216: Lunch [just below President Harding Rapids], Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Campbell, Ian, Oct. 15, 1937. Black-and-White Photograph, 8x12.
		NAU.PH.94.27.217: #92 Head of Hance Rapids., Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Campbell, Ian, Oct. 1937. Black-and-White Photograph, 8x12.
		NAU.PH.94.27.218: #104 Fracture cleavage in schist Vishnu Creek., Grand Canyon (Ariz.). Campbell, Ian, Oct. 23, 1937. Black-and-White Photograph, 8x12.
		NAU.PH.94.27.219: Boulder near Grapevine Canyon, Grand Canyon (Ariz.). Campbell, Ian, Oct. 24, 1937. Black-and-White Photograph, 12x8.
		NAU.PH.94.27.220: Beryl in peg. opp. Grapevine A-21, Grand Canyon (Ariz.). Campbell, Ian, Oct. 24, 1937. Black-and-White Photograph, 12x8.
		NAU.PH.94.27.221: Bob Jack Ian Mouth Boulder Creek #109, Grand Canyon (Ariz.). Unidentified, Oct. 1937. Black-and-White Photograph, 12x18.
		NAU.PH.94.27.222: A-24 Looking downstream from Lone Tree Canyon, Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Campbell, Ian, Oct. 25, 1937. Black-and-White Photograph, 12x8.
		NAU.PH.94.27.223: #113 Daredevil Bob Lone Tree Canyon, Grand Canyon (Ariz.). Campbell, Ian, Oct. 25, 1937. Black-and-White Photograph, 12x8.
		NAU.PH.94.27.224: A-26 Daredevil Bob Lone Tree, Grand Canyon (Ariz.). Campbell, Ian, Oct. 25, 1937. Black-and-White Photograph, 8x12.
		NAU.PH.94.27.225: A-27 D-D-Bob Lone Tree Canyon, Grand Canyon (Ariz.). Campbell, Ian, Oct. 25, 1937. Black-and-White Photograph, 12x8.
		NAU.PH.94.27.226: Examining Hermit Rapids #139, Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Campbell, Ian, Oct. 31, 1937. Black-and-White Photograph, 8x12.
		NAU.PH.94.27.227: A-35 Frank in Turquoise Rapids, Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Campbell, Ian, Nov 4, 1937. Black-and-White Photograph, 8x12.
		NAU.PH.94.27.228: #172 Serpentine Rapids, Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Campbell, Ian, Nov. 1937. Black-and-White Photograph, 8x12.
		NAU.PH.94.27.229: A-40 Looking down Shinumo Creek from below Shinumo gardens., Grand Canyon (Ariz.). Campbell, Ian, Nov. 1937. Black-and-White Photograph, 12x8.
		NAU.PH.94.27.230: A-42 Looking down near Shinumo Creek., Grand Canyon (Ariz.). Campbell, Ian, Nov. 5, 1937. Black-and-White Photograph, 8x11.
		NAU.PH.94.27.231: 258 Jack's Fire Gateway Canyon, Grand Canyon (Ariz.). Campbell, Ian, Nov. 1937. Black-and-White Photograph, 8x12.
		NAU.PH.94.27.232: Travertine Camp [Robert Sharp at left in plaid shirt; Frank Dodge on right], Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Campbell, Ian, Nov. 21, 1937. Black-and-White Photograph, 8x12.
		NAU.PH.94.27.233: B-31 Frank minus hat [Robert Sharp at left, in plaid], Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Campbell, Ian, Nov. 21, 1937. Black-and-White Photograph, 8x12.
		NAU.PH.94.27.234: B-34 Up anchor! [Buzz Holmstrom and Frank Dodge], Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Campbell, Ian, Nov. 11, 1937. Black-and-White Photograph, 8x12.
		NAU.PH.94.27.235: B-2 Looking down Dodge Rapids [232-Mile Rapids], Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Campbell, Ian, Nov. 22, 1937. Black-and-White Photograph, 8x12.
		NAU.PH.94.27.236: B-9 237 Mile Rapids, Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Campbell, Ian, Nov. 22, 1937. Black-and-White Photograph, 8x12.
		NAU.PH.94.27.237: B-15 Looking down Separation Canyon, Grand Canyon (Ariz.). Campbell, Ian, Nov. 23. 1937. Black-and-White Photograph, 8x12.
		NAU.PH.94.27.238: B-17 After 241 Mile Rapids, Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Campbell, Ian, Nov. 23, 1937. Black-and-White Photograph, 8x12.
		NAU.PH.94.27.239: B-20 Lava Cliff [Frank Dodge at right], Grand Canyon (Ariz.), Colorado River (Colo.-Mexico). Campbell, Ian, Nov. 24, 1937. Black-and-White Photograph, 8x12.
		NAU.PH.94.27.240: 386 Homeward Bound, Lake Mead (Ariz. and Nev.), Colorado River (Colo.-Mexico). Campbell, Ian, 1937. Black-and-White Photograph, 8x12.