Sources:

-Archaeologyinfo - http://archaeologyinfo.com
-Smithsonian National Museum of Natural History - http://humanorigins.si.edu
-The Variety of Life, Collin Tudge, 2000
-Wikipedia - http://en.wikipedia.org

Citation: García, A.I. 2015. The Tree Of Nature (Online) at http://thetreeofnature.com

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