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Topic
- Dams 17
- Rivers--Oregon 8
- Salmon 5
- Aerial photographs 4
- Bodies of water 4
- Fishes--Conservation 4
- Lectures and lecturing 4
- Northwest, Pacific 4
- Rivers 4
- Fishways 3
- Inland water transportation 2
- Rivers--Washington (State) 2
- Beavers 1
- Beer 1
- Bonneville Dam Fishways Committee 1
- Canned salmon 1
- Fish surveys 1
- Fishing 1
- Flood control 1
- Hops 1
