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Topic
- Fishways 132
- Dams 120
- Rivers--Oregon 63
- Rivers--Washington (State) 43
- Chinook salmon 9
- Salmon 8
- Hydroelectric power plants 7
- Power-plants 7
- Rivers 7
- Spillways 7
- Fishes--Conservation 3
- Lectures and lecturing 3
- Washington Water Power Company 3
- Waterfalls 3
- American wit and humor, Pictorial 2
- Beavers 2
- Canals 2
- Fish habitat improvement 2
- Fish traps 2
- Fishing 2
