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- Hydrology 28
- Irrigation 11
- Technology 7
- Aswan High Dam (Egypt) 6
- Building 6
- Groundwater 6
- Water quality 6
- Finance 5
- Dams 4
- Droughts 4
- Water-power 4
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- Agriculture 3
- Canals 3
- Economics 3
- Industries 3
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- Saline water conversion 3
- Climate 2
- Deserts 2
