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- Agriculture 8
- Hydrology 7
- Irrigation 7
- Watersheds 7
- Precipitation (Meteorology) 6
- Politics and government 5
- Aswan High Dam (Egypt) 4
- Groundwater 4
- Soils 4
- Technology 4
- Aquifers 3
- Bureaucracy 3
- Climate 3
- Dams 3
- Ecology 3
- Foreign relations 3
- International regimes 3
- Water quality 3
- Bibliography 2
- Deserts 2