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- Irrigation 104
- Agriculture 98
- Politics and government 91
- Bureaucracy 67
- Economics 61
- Building 50
- Water-supply 45
- Hydrology 44
- Dams 36
- Demography 33
- Groundwater 32
- Water quality 32
- Finance 30
- Technology 28
- Watersheds 26
- International regimes 24
- Canals 22
- Drainage 22
- Water-power 22
- Water consumption 20