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Subject
- Conservation of natural resources654
- Land use123
- Public lands97
- Law and legislation79
- Wilderness areas53
- Forest management51
- Management46
- Natural resources45
- Wildlife conservation44
- Environmental aspects42
- Environmental policy41
- Environmental protection33
- National parks and reserves30
- Study and teaching27
- Planning25
- Government policy19
- Recreation areas19
- Forest reserves18
- Nature conservation18
- Soil conservation18