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Origins of the underdevelopment of the Southern Sudan : British administrative neglect
Badal, Raphael Koba, (1980)
The medium of instruction and lingua-franca in the South : with special reference to the various local languages and their prevalence
Abu Bakr, Yousif El Khalifa, (19XX)
Education in the Southern provinces
al-Khalifa, al-Khatim, (1963)