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Creator
- United Nations 8
Topic
- Groundwater 8
- Aquifers 7
- Watersheds 7
- Reservoirs 3
- Artificial groundwater recharge 2
- Deserts 1
- French Territory of the Afars and Issas 1
- Hydrology 1
- Irrigation 1
- Meḳorot (Tel Aviv, Israel) 1
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Decade
- 1970-1979 8
