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Subject
- Conservation of natural resources272
- Forest reserves[remove]272
- Government purchasing of real property98
- Forest management89
- Legislative amendments85
- Financial statements60
- Federal receipts and expenditures57
- United States. National Forest Reservation Commission (1911-1976)50
- National parks and reserves46
- Wilderness areas41
- Public lands37
- Timber37
- Watersheds31
- Land classification29
- Logging26
- Land transfers24
- United States. Department of Agriculture22
- Wildlife refuges22
- Water and water supply20
- Forest and brush fires18