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- Forests and forestry 18
- Forest fires--Prevention and control 6
- Civilian Conservation Corps (U.S.) 5
- Barracks 3
- Camps 3
- Forest rangers 3
- Lumber trade 3
- Logging 2
- Ranger stations 2
- Trucks 2
- Agriculture 1
- Airplanes 1
- Fertilizers 1
- Forest fires 1
- Helicopters 1
- Hotels 1
- Mountains--Oregon 1
- Ranches--Oregon 1
- Resorts 1
- Sawmills 1