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- Forest fires--Prevention and control 57
- Forests and forestry 45
- Fire lookout stations 14
- Civilian Conservation Corps (U.S.) 10
- Logging 7
- Advocacy advertising 6
- Associations, institutions, etc 6
- Forest fires--Oregon 6
- Log transportation 6
- Loggers 6
- Lumber trade 6
- Natural resources 6
- Timber 6
- Mountains--Oregon 5
- Trails 4
- Camps 3
- College buildings 3
- Smokey Bear 3
- Women's Building 3
- Airplanes 2