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Bouzouggar, A., Barton, N., Vanhaeren, M. et al. (2007). 82,000-Year-Old Shell Beads from North Africa and Implications for the Origins of Modern Human Behavior. Proceedings of the National Academy of Sciences of the United States of America, 104, 9964-9969.
http://dx.doi.org/10.1073/pnas.0703877104

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