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- Rivers--Oregon 16
- Dams 15
- Agriculture 8
- Farm ownership 6
- Farm tenancy--Economic aspects 6
- Lichens 5
- Fishways 4
- Farms--Oregon 3
- Oregon State University. Extension Service 3
- Ranches--Oregon 3
- Agricultural laborers 1
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- Children 1
- College buildings 1
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- Dredging 1
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- Gravel 1