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Smith, A.  (2019, October 30). Ancient and Traditional Agriculture, Pastoralism, and Agricultural Societies in Sub-Saharan Africa. Oxford Research Encyclopedia of Environmental Science. Retrieved 14 Dec. 2019, from https://oxfordre.com/environmentalscience/view/10.1093/acrefore/9780199389414.001.0001/acrefore-9780199389414-e-179.