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Creator
- Salāmah, Ilyās 4
- Egypt. Wizārat al-Rayy 3
- Idelovitch, Emanuel 3
- Mara, D. Duncan (David Duncan), 1944- 3
- Beynon, R. B. 2
- Crusoe, Jonathan, 1953- 2
- Gedeon, R. (Raja) 2
- Geological Survey (U.S.) 2
- Gunnerson, Charles G. 2
- Keenan, John D. 2
- Michail, Medy 2
- Perrett, Heli 2
- Van Nostrand, John Cornelius, 1949- 2
- Wilson, James G. 2
- World Bank 2
- Abdou, Moussa Daoud 1
- Akin, E. W. (Elmer W.) 1
- Al-Muhandis, Majid H. 1
- Allan, H.A. 1
- Aly, Osama A. 1
