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- Irrigation 107
- Politics and government 107
- Agriculture 99
- Economics 93
- Building 81
- Bureaucracy 77
- Water-supply 56
- Hydrology 52
- Dams 43
- Water quality 43
- Finance 39
- Groundwater 36
- Demography 35
- Technology 30
- Watersheds 29
- Water-power 26
- International regimes 24
- Armed Forces 20
- Drainage 20
- Water consumption 20