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S. (2013, June 11). Goodall, Fossey & Galdikas: Great Minds. Retrieved July 05, 2018, from http://www.youtube.com/watch?v=0VRdDFwxwTg

Origin of Humans, Special Documentary 2016. (2016, December 21). Retrieved July 5, 2018, from http://www.youtube.com/watch?v=C7WHs6I1NLs

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