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- Rivers--Oregon 57
- Dams 34
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- Canals 16
- Tall fescue 9
- Marion County (Or.) 8
- Oregon State University. Extension Service 7
- Fishways 6
- Reiling, Norman 6
- Architecture, American 5
- Architecture--United States 5
- Harvesting 5
- Children 4
- Fish screens 4
- Salmon 4
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- Sowing 3
- art photography 3