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- Agriculture 131
- Technology 131
- Irrigation 69
- Economics 31
- Hydrology 19
- Water quality 19
- Saline water conversion 17
- Finance 16
- Groundwater 14
- Watersheds 14
- Politics and government 13
- Water consumption 12
- Dams 11
- Bureaucracy 10
- Demography 10
- Sewage 10
- Water-supply 10
- Sewage--Purification 9
- Building 8
- Industries 8
