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Subject
- United States. Department of the Interior70
- Indigenous peoples of North America56
- Public lands41
- National parks and reserves34
- Conservation of natural resources21
- Geology20
- Historic sites19
- Land titles17
- Legal status13
- Natural resources10
- Water9
- Water resources development9
- United States. National Park Service8
- Land tenure7
- Mines and mineral resources7
- Mining law7
- Reclamation of land7
- Wildlife conservation7
- Archaeology6
- Cherokee Indians6