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- Water quality 4
- Aquifers 2
- Groundwater 2
- Salinity 2
- Aswan High Dam (Egypt) 1
- Brackish waters 1
- Bureaucracy 1
- Deserts 1
- Fertility 1
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- Reclamation of land 1
- Reservoirs 1
- Sandstone 1
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- Water consumption 1
- Watersheds 1