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Topic
- Forests and forestry 59
- Civilian Conservation Corps (U.S.) 19
- Forest fires--Prevention and control 17
- Camps 9
- Mountains--Oregon 6
- Ranger stations 6
- Lakes--Oregon 5
- Portraits 4
- Portraits, Group 4
- Roads--Design and construction 3
- Fire lookout stations 2
- Forest fires 2
- Tree planting 2
- United States. Works Progress Administration 2
- Aspen 1
- Dynamite 1
- Fertilizers 1
- Formations (Geology) 1
- Helicopters 1
- Logging 1
