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- Dams 149
- Rivers--Washington (State) 95
- Rivers--Oregon 63
- Salmon 36
- Fishways 29
- Fish traps 28
- Chinook salmon 16
- Fishes--Conservation 12
- Flood control 8
- Inland water transportation 7
- Spillways 7
- Lectures and lecturing 6
- Aerial photographs 5
- Bodies of water 5
- Northwest, Pacific 5
- Rivers 5
- Fish stocking 4
- Izaak Walton League of America 4
- Steam-engines 4
- Fishing 3