Subject
Uranium ores
26
Water-supply
13
West (U.S.)
10
Geology, Stratigraphic
8
Water resources development
7
Geology
6
West (U.S.) History
6
Frontier and pioneer life
5
History
5
Phosphate rock
5
Reclamation of land History
5
Firearms History
4
Groundwater Pollution
4
Prospecting
4
Radioactive pollution of water
4
Radioactive prospecting
4
Railroads History
4
Uranium mill tailings Environmental aspects
4
Water conservation
4
Water resources development History
4
Coal
3
Colorado River (Colo.-Mexico)
3
Mines and mineral resources
3
Oil-shale industry
3
Photographers
3
Photography, Artistic
3
Railroads
3
Uranium mines and mining
3
Vanadium ores
3
Water quality
3
West (U.S.) Social life and customs
3
Carnotite
2
Colorado River (Colo.-Mexico) Power utilization
2
Cooking, American Western style
2
Energy development Environmental aspects
2
Geology, Structural
2
Irrigation History
2
Petroleum
2
Petroleum Geology
2
Petrology
2
Photography History
2
Photography in geography
2
Reclamation of land
2
Santa Fe National Historic Trail History
2
Shale
2
Slag Environmental aspects
2
Stream measurements
2
Tailings (Metallurgy) Environmental aspects
2
Thorium ores
2
Uranium mines and mining Environmental aspects
2
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