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Publisher
- United Nations Development Programme 4
- United States. Government Printing Office 4
- United States. Joint Publications Research Service 4
- World Bank 4
- Associates for Middle East Research 3
- Egypt. Wizārat al-Rayy 3
- Pergamon Press (Oxford, England) 3
- International Water Resources Association 2
- United Nations. Economic Commission for Africa 2
- United States. Foreign Broadcast Information Service 2
- World Meteorological Organization 2
- Academic Press 1
- American Society of Civil Engineers 1
- American Universities Field Staff 1
- British Broadcasting Corporation 1
- Centralny Instytut Informacji Naukowo-Technicznej i Ekonomicznej (Poland). Zakład Współpracy z Zagranicą w Zakresie Piśmiennictwa Naukowego 1
- Culture and Agriculture Group (U.S.) 1
- Egyptian Analyst 1
- Food and Agriculture Organization of the United Nations 1
- Institut agronomique méditerranéen de Montpellier 1
