Sahara and Sudan
by Gustav Nachtigal
University of California Press
Sahara und Sudan
First published under the title, Sahara und Sudan, 1879-1889
by Gustav Nachtigal ; translated from the original German, with new introd. and notes, by Allan G. B. Fisher and Humphrey J. Fisher with Rex S. O'Fahey
University of California press 1971 Sahara and Sudan / by Gustav Nachtigal v. 4
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