Subject
Reclamation of land History
8
Water resources development History
4
History
3
Dams History
2
Hydroelectric power plants History
2
Irrigation History
2
Water-power History
2
Community life History
1
Environmental policy History
1
Farmers History
1
Frontier and pioneer life
1
Irrigation Environmental aspects History
1
Sustainable agriculture History
1
Veterans History
1
Water-supply Economic aspects History
1
Water-supply Government policy History
1
West (U.S.) Economic conditions
1
West (U.S.) Environmental conditions
1
West (U.S.) History
1
West (U.S.) Social life and customs
1
World War, 1939-1945 Veterans
1