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- Water-power 91
- Politics and government 43
- Irrigation 38
- Hydrology 31
- Water diversion 28
- Building 22
- United Nations 22
- International regimes 21
- Canals 17
- Groundwater 17
- Technology 16
- Water quality 15
- Agriculture 14
- Economics 14
- Resource allocation 14
- Armed Forces 12
- Armistices 11
- Dams 10
- Tiberias, Lake (Israel) 10
- Finance 9
