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- Bonneville Dam (Or. and Wash.) 13
- Dams 5
- American wit and humor, Pictorial 3
- Oregon--Politics and government 3
- United States--Politics and government--1933-1953 3
- United States--Politics and government--Caricatures and cartoons 3
- World politics--Caricatures and cartoons 3
- Aerial photography 2
- Anniversaries 2
- Columbia River 2
- Fisheries 2
- Locks (Hydraulic engineering) 2
- Locks (Hydraulic engineering)--Oregon 2
- Special events 2
- Fishways 1
- Landscapes 1
- Mountains 1
- Rivers 1
- Salmon industry 1
- Skiers 1