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- Dams 41
- Rivers--Oregon 22
- Rivers--Washington (State) 16
- Fishways 10
- Northwest, Pacific 10
- Salmon 6
- Aerial photographs 5
- Bodies of water 5
- Bonneville Dam (Or. and Wash.) 5
- Rivers 5
- Fishes--Conservation 4
- Irrigation 4
- Lectures and lecturing 4
- Maps 4
- Water-power 4
- Beavers 2
- Fish stocking 2
- Fisheries 2
- Fishing 2
- Hydroelectric power plants 2
