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- Water resources development 3
- American wit and humor, Pictorial 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
- Agriculture 1
- Bodies of water 1
- Conservation of natural resources 1
- Dalles Dam (Or. and Wash.) 1
- Fisheries 1
- Forests and forestry 1
- Irrigation projects 1
- Locks (Hydraulic engineering)--Oregon 1
- Maps 1
- Mineral industries 1
- National parks and reserves 1
- Northwest, Pacific 1
- Photography 1
- Renewable energy sources 1
