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- Saline water conversion 174
- Technology 97
- Water quality 62
- Economics 56
- Irrigation 42
- Hydrology 39
- Agriculture 37
- Groundwater 34
- Building 32
- Politics and government 27
- Reverse osmosis 27
- Aquifers 20
- Finance 20
- Water-supply 17
- Sewage 16
- Resource allocation 15
- Water--Purification--Distillation process 14
- Demography 13
- Water consumption 13
- Industries 12
