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- Watersheds 8
- Groundwater 7
- Aquifers 6
- Reservoirs 3
- Artificial groundwater recharge 2
- Bibliography 1
- Deserts 1
- French Territory of the Afars and Issas 1
- Hydrology 1
- Irrigation 1
- Meḳorot (Tel Aviv, Israel) 1
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- Precipitation (Meteorology) 1
- Salinity 1
- Tanzania 1
- United Arab Republic 1
- United Nations 1
- Water quality 1