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- Forests and forestry 156
- Civilian Conservation Corps (U.S.) 39
- Forest fires--Prevention and control 17
- Rivers--Oregon 14
- Camps 13
- Roads 13
- College students 10
- Forests and forestry--Oregon--Periodicals 10
- Mountains--Oregon 10
- Ranger stations 10
- Redwoods 10
- Universities and colleges--Periodicals 10
- Lakes--Oregon 9
- Parks 7
- Wildfires 6
- Portraits, Group 5
- Signs and signboards 5
- Roads--Design and construction 4
- Agriculture 3
- Burning of land 3