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Topic
- Fishways 6
- Dams 4
- Rivers 4
- American wit and humor, Pictorial 2
- Fish habitat improvement 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
- Dikes (Engineering) 1
- Fishes 1
- Fishes--Effect of dams on 1
- Hydraulic engineering 1
- Hydraulic structures 1
- Irrigation 1
- Locks (Hydraulic engineering)--Oregon 1
- Salmon industry 1
- Shipping 1
- Sluice gates 1
