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A history of the southern Sudan 1839-1889
Gray, Richard, (1961)
Oil and regional sentiment in southern Sudan
Badal, Raphael K., (1983)
South Sudan : Institutional Legacy of Colonialism and the Making of a New State
Zambakari, Christopher, (2017)
Problems in African history
Collins, Robert O., (1968)
King Leopold, England, and the Upper Nile, 1899-1909
The partition of Africa : illusion or necessity
Collins, Robert O., (1969)