Water resources survey 1949
"July 1949." Titles from cover " ... in cooperation with the State Water Conservation Board [and the Montana State Agricultural Experiment Station]. Mr. Gerald A. Oravetz ... directed the detail office and field work of this project."--Letter of transmittal pt. 1. History of land and water use on irrigated areas -- pt. 2. Maps showing irrigated areas in color designating the sources of supply
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