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- Dams 54
- Lichens 40
- Rivers--Washington (State) 21
- Fish screens 17
- Ditches 14
- Fishways 13
- Architecture, American 6
- Architecture--United States 6
- Canals 4
- Rivers--Oregon 4
- Boats 3
- Irrigation canals and flumes 2
- Spillways 2
- Canyons 1
- Flumes 1
- Maps 1
- Oak 1
- Pine 1
- Rapids 1
- Trees 1