Wooden Yoke Used in Coffle, East Africa, 1882
Alfred J. Swann, Fighting the slave-hunters in Central Africa, a record of twenty-six years of travel & adventures round the Great Lakes (London, 1910; reprinted London 1969), p. 51.
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"Wooden Yoke Used in Coffle, East Africa, 1882", Slavery Images: A Visual Record of the African Slave Trade and Slave Life in the Early African Diaspora, accessed February 21, 2020, http://www.slaveryimages.org/s/slaveryimages/item/441