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- Rivers--Oregon 13
- Dams 4
- Fishways 4
- Waterfalls 4
- Agriculture 2
- Forests and forestry 2
- Lumber trade 2
- Oregon State University. Extension Service 2
- Water-wheels 2
- Housing 1
- Labor camps 1
- Lichens 1
- Raspberries 1
- Sawmills 1
- Spraying and dusting in agriculture 1
- Steam-engines 1
- Traffic signs and signals 1
