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Topic
- Fishways 39
- Dams 36
- Rivers--Washington (State) 19
- Rivers--Oregon 11
- Chinook salmon 9
- Salmon 4
- Lectures and lecturing 3
- Spillways 3
- American wit and humor, Pictorial 2
- Beavers 2
- Fish traps 2
- Fishes--Conservation 2
- Fishing 2
- Hydroelectric power plants 2
- Oregon--Politics and government 2
- United States--Politics and government--1933-1953 2
- United States--Politics and government--Caricatures and cartoons 2
- World politics--Caricatures and cartoons 2
- Bonneville Dam (Or. and Wash.) 1
- Bonneville Dam Fishways Committee 1