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- Rivers--Oregon 93
- Lichens 54
- Linn County (Or.) 46
- Dams 37
- Agriculture 36
- Farm ownership 26
- Farm tenancy--Economic aspects 26
- Farms--Oregon 24
- Croplands 15
- Fishways 12
- Hay 10
- Crown Zellerbach Corporation 8
- Wheat 8
- Fish hatcheries 7
- Agricultural laborers 6
- Albany (Or.) 6
- Cattle 6
- Graminaceae 6
- Beans 5
- Canals 5
