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21	Author:	Compañia Constructora Richardson, S.A.	Requires cookie*
	Title:	Records of the Compañia Constructora Richardson, S.A., 1904-1968 1904-1927 ead
	Date(s):	1904-1968
	Abstract:	Records, 1904-1968 (bulk 1904-1927). Collection consists primarily of photographs, legal papers, and other materials concerning the development of a railroad and irrigation system in the Yaqui River Valley, Sonora, Mexico.
	Repository:	University of Arizona Libraries, Special Collections
	Subjects:	Water rights -- Mexico -- Yaqui River \| Irrigation engineering -- Mexico -- Yaqui River \| Agriculture and state -- Mexico -- Sonora (State) \| Agricultural colonies -- Mexico -- Sonora (State) \| Yaqui Indians -- Photographs \| Indians of Mexico -- Mexico -- Sonora (State) -- Photographs
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22	Author:	Garfias, Ignacio	Requires cookie*
	Title:	Costa de Sotavento, Estado de Veracruz, Mexico, September 5, 1880 ead
	Date(s):	September 5, 1880
	Abstract:	Single signed, 22-page holographic manuscript contains a detailed description of the southern coastal region of Veracruz, with a view to the full utilization and development of its natural resources; probably commissioned by a government agency.
	Repository:	University of Arizona Libraries, Special Collections
	Subjects:	Natural resources -- Mexico -- Veracruz (State) -- History -- Sources \| Agriculture -- Economic aspects -- Mexico -- Veracruz (State) -- History -- Sources \| Hydrography -- Mexico -- Veracruz (State) -- History -- Sources \| Hydrographic surveying -- Mexico -- Veracruz (State) -- History -- Sources \| Inland navigation -- Mexico -- Veracruz (State) -- History -- Sources
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23	Author:	Schwalen, Harold Christy, 1895-1987	Requires cookie*
	Title:	Harold Christy Schwalen papers, 1896-1967 (bulk 1919-1965) ead
	Date(s):	1896-1967 (bulk 1919-1965)
	Abstract:	Collection includes research notes, maps, blueprints, correspondence, photographs, and other material gathered for his research projects. Includes data from the Department's agricultural experiment stations; surface and groundwater studies; wells and pump irrigation; flow records; climatological data; and manuscript reports and papers. Also includes over 2000 photographs illustrating well drilling, floods and erosion, pumps and pumping plants, irrigation projects, and concrete pipe and ditch construction.
	Repository:	University of Arizona Libraries, Special Collections
	Subjects:	Snow surveys -- Arizona \| Groundwater -- Arizona \| Water supply -- Arizona \| Building, Adobe -- Arizona \| Agricultural Engineering -- Arizona \| Agriculture -- Arizona \| Weather -- Arizona -- Observations \| Cotton -- Research -- Arizona \| Floodplains -- Arizona -- Cochise County -- Management \| Floodplains -- Arizona -- Tucson -- Management \| Gila River Watershed (N.M. and Ariz.) \| Guayule \| Salt River Project \| Irrigation -- Arizona \| Lettuce -- Arizona
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