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- Forests and forestry 238
- Mountains--Oregon 41
- Civilian Conservation Corps (U.S.) 36
- Roads 36
- Forest fires--Prevention and control 33
- Lakes--Oregon 29
- Redwoods 23
- Camps 19
- Rivers--Oregon 18
- Ranger stations 12
- Fire lookout stations 10
- Parks 10
- Portraits, Group 9
- Signs and signboards 6
- Forest rangers 5
- Bridges 4
- Footbridges 4
- Roads--Design and construction 4
- Forest fires 3
- Logging 3