Subject
Irrigation History
Water resources development History
4
History
3
Reclamation of land History
3
Dams History
2
Irrigation farming
2
Agricultural ecology History
1
Agriculture History
1
Colorado River Valley (Colo.-Mexico) Environmental conditions
1
Colorado River Valley (Colo.-Mexico) History
1
Excavations (Archaeology)
1
Hohokam culture
1
Indian allotments History
1
Indians of North America History
1
Irrigation
1
Irrigation Political aspects History
1
Irrigation canals and flumes History
1
Irrigation districts History
1
Irrigation water History
1
Land settlement History
1
Ogallala Aquifer History
1
Pecos River Valley (N.M. and Tex.) History
1
Salt River Valley (Gila County and Maricopa County, Ariz.) Antiquities
1
Salvage archaeology
1
Water conservation
1
Water use History
1
Yuma Valley (Ariz.) Environmental conditions
1
Yuma Valley (Ariz.) History
1