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- Demography 6
- Irrigation 5
- Water-supply 5
- Agriculture 4
- Population 4
- Economics 3
- Hydrology 3
- Politics and government 3
- Saline water conversion 3
- Technology 3
- Water quality 3
- Contamination of environment 2
- Finance 2
- Groundwater 2
- Industries 2
- Population policy 2
- Subsidies 2
- Aquifers 1
- Bibliography 1
- Bureaucracy 1
