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- Forests and forestry 28
- Forest fires--Prevention and control 6
- Civilian Conservation Corps (U.S.) 4
- Forest rangers 4
- Camps 3
- Lakes--Oregon 3
- Ranger stations 3
- Barracks 2
- Footbridges 2
- Signs and signboards 2
- Trucks 2
- Airplanes 1
- Automobiles 1
- Fertilizers 1
- Fish hatcheries 1
- Fish stocking 1
- Forest fires 1
- Helicopters 1
- Mountains--Oregon 1
- Photography 1