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- Politics and government 11
- Demography 10
- Agriculture 8
- International regimes 8
- Census 7
- Irrigation 7
- Hydrology 6
- Groundwater 5
- Technology 5
- Watersheds 5
- Aswan High Dam (Egypt) 4
- Dams 4
- Resource allocation 4
- Water-supply 4
- Foreign relations 3
- Water consumption 3
- Water quality 3
- Aquifers 2
- Bureaucracy 2
- Desertification 2
