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- Groundwater 38
- Irrigation 17
- Hydrology 14
- Agriculture 12
- Watersheds 12
- Politics and government 11
- Precipitation (Meteorology) 10
- Water-supply 9
- Technology 8
- Aquifers 7
- Economics 7
- Water consumption 7
- Demography 5
- Finance 5
- International regimes 4
- Water quality 4
- Bibliography 3
- Climate 3
- Pipelines 3
- Salinity 3