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1by International Conference on Water Resources Needs and Planning in Drought Prone Areas, Khartoum, 1986, Sudan Engineering Society, International Association for Hydraulic Research, United Nations Development Programme, Abdel-Magid, Isam Mohamed, Khadam, Mohamed Ahmed, Osman, Mohamed Akode, Abdo, Gamal Murtadaprogramme and meeting document bibliotecaUNESCO