Subject
United States Politics and government
3
African Americans Civil rights History
2
Hunting and gathering societies
2
Indians of North America Antiquities
2
United States History
2
African Americans
1
African Americans History
1
African Americans Legal status, laws, etc. History
1
African Americans Suffrage History
1
Antiquities, Prehistoric
1
Centenarians
1
Civil rights demonstrations History
1
Civil rights movements
1
Conservation of natural resources Government policy History
1
Conservatism
1
Critical thinking
1
Devils Tower National Monument (Wyo.)
1
Environmental policy History
1
Excavations (Archaeology)
1
Freedom of religion
1
Great Basin History
1
Historic preservation
1
Historic sites Interpretive programs
1
Historical museums
1
Hopi Indians Religion
1
Human beings Effect of climate on
1
Human ecology
1
Indians of North America History
1
Indians of North America Land tenure
1
Indians of North America Legal status, laws, etc
1
Indians of North America Religion
1
Indians of North America Wars
1
Lakota Indians Religion
1
Land use Government policy History
1
Legislators
1
Mass media Political aspects
1
Mineral industries Environmental aspects
1
Mount Shasta (Calif.)
1
Navajo Indian Reservation History
1
Navajo Indians Government relations History
1
Navajo Indians Health and hygiene History
1
New Age movement
1
North America Antiquities
1
Paleo-Indians
1
Paleoecology
1
Petroglyphs Conservation and restoration
1
Pleistocene-Holocene boundary
1
Political culture
1
Political satire, American
1
Popular culture
1
more ...