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- Lichens 23
- Architecture, American 11
- Architecture--United States 11
- Rivers--Oregon 2
- 4-H clubs 1
- Agriculture 1
- Camps 1
- Croplands 1
- Dams 1
- Farm ownership 1
- Farm tenancy--Economic aspects 1
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- Oregon State University. Extension Service 1
- Railroad tunnels 1
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- Universities and colleges--Faculty 1