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- Politics and government 185
- Agriculture 178
- Irrigation 163
- Finance 138
- Economics 121
- Water quality 97
- Technology 93
- Demography 91
- Groundwater 88
- Building 80
- Hydrology 75
- Bureaucracy 72
- Aswan High Dam (Egypt) 71
- Water-supply 58
- International regimes 57
- Dams 47
- Watersheds 47
- Water consumption 40
- Water-power 38
- Sewage 35
