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- Saline water conversion 172
- Technology 96
- Water quality 62
- Economics 56
- Irrigation 41
- Hydrology 38
- Agriculture 36
- Groundwater 34
- Building 32
- Politics and government 27
- Reverse osmosis 27
- Finance 20
- Aquifers 19
- Sewage 16
- Water-supply 16
- Resource allocation 15
- Water--Purification--Distillation process 14
- Demography 13
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- Industries 12