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- Forests and forestry 523
- Mountains--Oregon 53
- Roads 43
- Civilian Conservation Corps (U.S.) 41
- Forest fires--Prevention and control 35
- Rivers--Oregon 35
- Lakes--Oregon 34
- Universities and colleges--Faculty 30
- Portraits, Group 26
- Redwoods 24
- Range management 23
- Camps 20
- Meetings 19
- Wildfires 18
- Lumber trade 17
- Cutover lands 13
- Parks 13
- Portraits 13
- Universities and colleges--Alumni and alumnae 13
- Fire lookout stations 12