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- Agriculture 6
- Politics and government 6
- Hydrology 5
- Irrigation 5
- Groundwater 4
- Economics 3
- International regimes 3
- Negotiation 3
- Resource allocation 3
- Technology 3
- Water diversion 3
- Water quality 3
- Water-power 3
- Climate 2
- Demography 2
- Precipitation (Meteorology) 2
- Water--Purification--Distillation process 2
- Water-supply 2
- Watersheds 2
- Aquifers 1