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Subject
- United States. Department of the Interior252
- Land titles199
- Public lands134
- Indigenous peoples of North America126
- Historic sites125
- National parks and reserves111
- Forest reserves76
- Water resources development68
- Legal status66
- United States. Department of Agriculture66
- Wildlife conservation52
- United States. National Park Service49
- Fishery law and legislation48
- Endangered species45
- United States. Bureau of Land Management44
- Indian land transfers42
- Wilderness areas42
- Conservation of natural resources41
- Land use39
- Fisheries34