Subject
United States History
17
United States Politics and government
12
Water rights
12
Legislators
11
United States Discovery and exploration
11
History
10
Indians of North America Wars
8
Water Law and legislation
8
United States
7
Explorers
6
Colorado Politics and government
5
Little Bighorn, Battle of the, Mont., 1876
5
Soldiers
5
United States History Regimental histories
5
Colorado History
4
Colorado River (Colo.-Mexico) Description and travel
4
Frontier and pioneer life
4
Oil-shales
4
United States History Campaigns
4
West (U.S.) History
4
Baseball umpires
3
Colorado
3
Colorado River (Colo.-Mexico)
3
Colorado River (Colo.-Mexico) Discovery and exploration
3
Grand Canyon (Ariz.)
3
Indians of North America Government relations
3
National parks and reserves
3
Oil-shale industry
3
Railroads
3
Southwest, New Description and travel
3
Travel
3
United States Civilization
3
United States Foreign relations
3
United States History Causes
3
United States History State & Local West
3
Uranium ores
3
Water resources development
3
Water-supply Government policy
3
West (U.S.)
3
West (U.S.) Discovery and exploration
3
World War, 1939-1945
3
Artists
2
Authors, American
2
Capitalists and financiers
2
Cattle
2
Cattle trade
2
Ceramic sculpture, American Catalogs
2
Circus
2
Civilization, Western
2
Colorado River (Colo.-Mexico) Water rights
2
more ...