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- Forests and forestry 152
- Forest fires--Prevention and control 29
- Mountains--Oregon 28
- Rivers--Oregon 19
- Lakes--Oregon 18
- Wildfires 18
- Civilian Conservation Corps (U.S.) 16
- Cutover lands 11
- Tillamook Burn, Or., 1933 11
- Camps 10
- Roads 10
- Fire lookout stations 8
- Forest fires 6
- Ranger stations 6
- Forest rangers 4
- Sheep 4
- Cattle 3
- Graminaceae 3
- Ponderosa pine 3
- Portraits, Group 3