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Subject
- Conservation of natural resources52
- Land use[remove]52
- United States[remove]52
- Public lands34
- Wilderness areas9
- Environmental aspects6
- Planning6
- Range management6
- Management5
- Natural resources3
- Wildlife conservation3
- Forest management2
- History2
- National parks and reserves2
- Renewable natural resources2
- Resource allocation2
- Acreage allotments (Agricultural policy)1
- Agricultural Adjustment Act1
- Agricultural credit1
- Agricultural policy1