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Topic
- Irrigation 254
- Agriculture 106
- Politics and government 84
- Technology 74
- Hydrology 73
- Groundwater 68
- Economics 58
- Water quality 45
- Resource allocation 41
- Water diversion 38
- Water-power 38
- Building 37
- Watersheds 33
- Water consumption 29
- International regimes 28
- Aquifers 24
- Demography 24
- Saline water conversion 24
- Dams 23
- Water-supply 23
