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A history of the southern Sudan 1839-1889
Gray, Richard - 1961
Persistent link: https://www.econbiz.de/10000627967
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From c. 1600 to c. 1790
Gray, Richard (contributor); Fage, John D. (contributor);  … - 1975
Persistent link: https://www.econbiz.de/10000095304
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Pre-colonial African trade : essays on trade in Central and Eastern Africa before 1900
Gray, Richard (ed.); Birmingham, David (ed.) - 1970
Persistent link: https://www.econbiz.de/10014340722
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Pre-colonial African trade : essays on trade in Central and Eastern Africa before 1900
Gray, Richard (contributor) - 1970
Persistent link: https://www.econbiz.de/10004707274