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- Irrigation 58
- Agriculture 33
- Politics and government 17
- Hydrology 16
- Groundwater 14
- Finance 11
- Dams 10
- Watersheds 10
- Bureaucracy 7
- Demography 7
- Economics 6
- Technology 6
- Water-power 6
- Aswan High Dam (Egypt) 5
- Drainage 5
- Gezira (Sudan : Region) 5
- International regimes 4
- Resource allocation 4
- Water-supply 4
- Aquifers 3
