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- Rivers--Oregon 80
- Lichens 63
- Waterfalls 35
- Agriculture 18
- Dams 13
- Oregon State University. Extension Service 10
- Farm ownership 8
- Farm tenancy--Economic aspects 8
- Barns 7
- Croplands 7
- Farms--Oregon 7
- Sawmills 7
- Portraits, Group 6
- Forests and forestry 5
- Camps 4
- Mints (Plants) 4
- Rapids 4
- Roads 4
- Agricultural laborers 3
- Coarse woody debris 3