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- Politics and government 38
- Irrigation 23
- Hydrology 21
- Demography 19
- Economics 19
- International regimes 17
- Technology 17
- Agriculture 16
- Groundwater 15
- Resource allocation 13
- Armed Forces 12
- Water-supply 12
- Water-power 11
- Water quality 10
- Negotiation 9
- Dams 8
- Saline water conversion 8
- Aquifers 7
- Building 7
- Water diversion 7