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- Agriculture 54
- Politics and government 50
- Bureaucracy 46
- Irrigation 40
- Economics 28
- Groundwater 27
- Demography 23
- Water quality 21
- Finance 19
- Water-supply 18
- Hydrology 16
- Technology 15
- Water consumption 13
- Dams 11
- Industries 11
- Wells 11
- International regimes 10
- Water-power 10
- Droughts 9
- Occupied territories 9