Africa's Great Civilizations, Episode 6, Commerce and the Clash of Civilizations
directed by Karen McGann, 1975-; presented by Henry Louis Gates, Jr., 1950-; produced by Karen McGann, 1975-, McGee Media, Inkwell Films and Kunhardt Films, in Africa's Great Civilizations, Episode 6 (Arlington, VA: Public Broadcasting Service, 2017), 53 mins
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