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- Irrigation 24
- Agriculture 19
- Groundwater 18
- Politics and government 15
- Hydrology 14
- Water quality 14
- Water-supply 14
- Watersheds 13
- Aquifers 12
- Finance 9
- Water consumption 9
- Economics 8
- Bureaucracy 7
- Industries 6
- International regimes 6
- Technology 5
- Wells 5
- Armed Forces 4
- Demography 4
- Drinking water 4
