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Subject
- Conservation of natural resources164
- Land use[remove]164
- Public lands81
- United States49
- Wilderness areas34
- Planning30
- Environmental aspects27
- Management13
- Natural resources13
- Wildlife conservation13
- Range management10
- Environmental policy7
- National parks and reserves7
- Regional planning6
- Deserts5
- Coal mines and mining4
- Forest management4
- Nature conservation4
- Wildlife refuges4
- Environmental protection3