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- Population 51
- Demography 38
- Hydrology 19
- Economics 18
- Politics and government 15
- Climate 14
- Water quality 14
- Groundwater 9
- Agriculture 8
- Health 6
- Aquifers 5
- Diseases 5
- Water consumption 5
- Water-supply 5
- Saline water conversion 4
- Finance 3
- Irrigation 3
- Resource allocation 3
- Watersheds 3
- West Bank 3