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The shallow ground water of the Gezira formation at Khartoum and the Northern Gezira
El Boushi, Ismail Mudathir, (1972)
Gaps in the water provision map of the Sudan
El Sammani, M. O., (1978)
Vodnye resursy i razmeščenie naselenija v Respublike Sudan
Dmitrevskij, Ju. D., (1966)