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From the Cover: A Howiesons Poort tradition of engraving ostrich eggshell containers dated to 60,000 years ago at Diepkloof Rock Shelter, South Africa.
Texier PJ, Porraz G, Parkington J, Rigaud JP, Poggenpoel C, Miller C, Tribolo C, Cartwright C, Coudenneau A, Klein R, Steele T, Verna C. Texier PJ, et al. Among authors: coudenneau a. Proc Natl Acad Sci U S A. 2010 Apr 6;107(14):6180-5. doi: 10.1073/pnas.0913047107. Epub 2010 Mar 1. Proc Natl Acad Sci U S A. 2010. PMID: 20194764 Free PMC article.