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State and development in the Black Sudan
Ayoker, Kunijwok Gwado, (1983)
Oil and regional sentiment in southern Sudan
Badal, Raphael K., (1983)
The Southern Sudan : A study in rural land use development
Abd-el-Maksoud, Zein-el-Din, (1976)
The Addis Ababa Agreement: ten years after : an assessment
Badal, Raphael K., (1985)