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Creator
- Food and Agriculture Organization of the United Nations 4
- United Nations Development Programme 4
- 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
- Bergquist, Wenonah E. 1
- Bisson, Robert A. 1
- Collins, Robert O. 1
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Donor
- Naff, Thomas 48
Topic
- Watersheds 48
- Groundwater 21
- Agriculture 19
- Irrigation 16
- Aquifers 14
- Hydrology 11
- Aswan High Dam (Egypt) 8
- Demography 8
- Soils 8
- Climate 7
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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
- Universiṭah ha-ʻIvrit bi-Yerushalayim 2
- Academic Press 1
- Arab Centre for the Studies of Arid Zones and Dry Lands 1
- Centralny Instytut Informacji Naukowo-Technicznej i Ekonomicznej (Poland). Zakład Współpracy z Zagranicą w Zakresie Piśmiennictwa Naukowego 1
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