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- Mountains--Oregon 30
- Forests and forestry 12
- Lakes--Oregon 5
- Rivers--Oregon 4
- Forest fires--Prevention and control 3
- Jefferson, Mount (Or.) 3
- Boats 2
- Fire lookout stations 2
- Forest reserves--Oregon 2
- Mazamas (Portland, Or.) 2
- Mountaineering 2
- Airplanes 1
- Formations (Geology) 1
- Lakes 1
- Mountains 1
- Mountains--Washington (State) 1
- Northwestern Electric Company 1
- Roads 1
- Trees 1
