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- Agriculture 200
- Irrigation 90
- Politics and government 53
- Demography 41
- Economics 41
- Technology 39
- Groundwater 29
- Finance 28
- Drainage 23
- Hydrology 22
- Water quality 20
- Watersheds 19
- Aswan High Dam (Egypt) 18
- Bureaucracy 18
- Soils 18
- Reclamation of land 16
- Water-supply 15
- Dams 14
- Water consumption 14
- Climate 12