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- Dams 96
- Rivers--Oregon 81
- Rivers--Washington (State) 68
- Salmon 33
- Fish traps 24
- Waterfalls 20
- Fishing 19
- Fishways 18
- Chinook salmon 15
- Fishing boats 13
- Water--Pollution 12
- Lectures and lecturing 11
- Seining 11
- Rivers 9
- Inland water transportation 8
- Aerial photographs 7
- Bodies of water 7
- Fishes--Conservation 7
- Izaak Walton League of America 7
- Northwest, Pacific 7
