Sudan, Maṣlaḥat al-Misāḥah. Sudan Survey Dept. "Topo. No. S 913." "July 1949 (Topo. No. S 820-49).". Sudan Survey Dept.
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Sudan, Maṣlaḥat al-Misāḥah. Sudan Survey Dept. "Sudan Survey Dept., Khartoum October 1963 (Topo. no. S 820 - 49)." "Sudan Survey Dept., Khartoum, July 1949 (Topo. no. S.906 - ... Sudan Survey Dept.