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- Irrigation 7
- Groundwater 6
- Economics 5
- Hydrology 5
- Agriculture 4
- Demography 4
- Politics and government 4
- Resource allocation 4
- Bibliography 2
- Dams 2
- Finance 2
- International regimes 2
- Reservoirs 2
- Water-supply 2
- Watersheds 2
- Agriculture and state 1
- Aquifers 1
- Armed Forces 1
- Commerce 1
- Drinking water 1