Subject
West (U.S.)
21
Indians of North America
10
West (U.S.) History
10
Artists
5
Frontier and pioneer life
5
History
3
Photography, Artistic
3
West (U.S.) Social life and customs
3
Photography History
2
Photography in geography
2
Railroads
2
West (U.S.) Description and travel
2
Architecture
1
Art
1
Art and photography
1
Cheyenne Indians
1
Colorado (Col.-Mexique : Fleuve) Ouvrages illustres
1
Colorado Discovery and exploration
1
Colorado River (Colo.-Mexico)
1
Cowboys
1
Dakota Indians
1
Dams
1
Deserts
1
Documentary photography
1
Earth dams
1
Endemic plants Flowering
1
Etats-Unis (Ouest) Ouvrages illustres
1
Extinct cities
1
Fires
1
Geology
1
Gold miners
1
Gold mines and mining
1
Grand Canyon (Ariz.)
1
Grand Canyon (Ariz.) Ouvrages illustres
1
Historic trees
1
Hydroelectric power plants History
1
Illustrated books
1
Indians of North America Social life and customs
1
Irrigation History
1
Landscape photography
1
Landscape photography History
1
Livestock poisoning plants
1
Livestock poisoning plants Identification
1
Mines and mineral resources
1
National parks and reserves
1
Natural areas
1
Natural resources conservation areas
1
New Mexico Discovery and exploration
1
Painters
1
Peace officers
1
more ...