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Creator
- Food and Agriculture Organization of the United Nations 4
- United Nations Development Programme 4
- Bergquist, Wenonah E. 2
- Ezzat, Mohamed Aly 2
- Kolars, John F. 2
- United Nations 2
- Arab Centre for the Studies of Arid Zones and Dry Lands 1
- Awartani, Hisham M. 1
- Bisson, Robert A. 1
- Collins, Robert O. 1
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Topic
- Watersheds 51
- Groundwater 23
- Agriculture 19
- Irrigation 18
- Aquifers 14
- Hydrology 13
- Soils 9
- Aswan High Dam (Egypt) 8
- Demography 8
- Water quality 8
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Publisher
- United States. Joint Publications Research Service 5
- Unesco 4
- United Nations 4
- Pergamon Press (Oxford, England) 3
- Food and Agriculture Organization of the United Nations 2
- International Association of Scientific Hydrology 2
- United States. Government Printing Office 2
- Universiṭah ha-ʻIvrit bi-Yerushalayim 2
- Academic Press 1
- Arab Centre for the Studies of Arid Zones and Dry Lands 1
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