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- Politics and government 13
- Agriculture 9
- Irrigation 7
- Demography 6
- Economics 6
- Watersheds 6
- Hydrology 5
- Technology 5
- Water quality 5
- Bureaucracy 4
- Climate 4
- Finance 4
- Palestinian Arabs 4
- Precipitation (Meteorology) 4
- Sewage 4
- Water-power 4
- Water-supply 4
- Dams 3
- Groundwater 3
- Reclamation of land 3