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- China 199
- China--Politics and government 128
- China--History 68
- Korea (North) 48
- Agriculture 23
- China--History--Cultural Revolution, 1966-1976 23
- Watersheds 23
- Politics and government 22
- Hydrology 21
- Irrigation 16
- Precipitation (Meteorology) 16
- Japan 15
- Groundwater 14
- Water-supply 14
- Climate 13
- Korea (North)--Politics and government 12
- Water diversion 12
- Economics 10
- Building 9
- Cinema--Korea (North) 9