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Subject
- Forests and forestry24
- Forest reserves14
- Forest fires10
- United States. Forest Service10
- Prevention and control9
- Research9
- Forest insects6
- Trees6
- Aerial photography in forestry5
- Diseases and pests5
- Remote sensing5
- Tree planting4
- Fire management3
- Forest policy3
- Wildfires3
- Aerial photogrammetry2
- Forest health2
- Forest products2
- Forest protection2
- Forest surveys2