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- Nuclear energy 7
- Groundwater 3
- American wit and humor, Pictorial 2
- Hydrology 2
- Oregon--Politics and government 2
- Technology 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
- Aquifers 1
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- Dams 1
- Economics 1
- International regimes 1
- Politics and government 1
- Reservoirs 1
- Soviet Union 1
- Sprinkler irrigation 1
