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- Dams 22
- Aswan High Dam (Egypt) 6
- Columbia River 5
- Building 4
- Politics and government 4
- Soviet Union 4
- Bonneville Dam (Or. and Wash.) 3
- Grand Coulee Dam (Wash.) 3
- Groundwater 3
- Watersheds 3
- Agriculture 2
- Demography 2
- Hydrology 2
- Irrigation 2
- Precipitation (Meteorology) 2
- Water diversion 2
- Aerial photographs 1
- Bodies of water 1
- Dalles (Or.) 1
- Dalles Dam (Or. and Wash.) 1