East African megadroughts between 135 and 75 thousand years ago and bearing on early-modern human origins.
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Proc Natl Acad Sci U S A. 2007 Oct 16;104(42):16416-21. doi: 10.1073/pnas.0703874104. Epub 2007 Sep 4.
Proc Natl Acad Sci U S A. 2007.
PMID: 17785420
Free PMC article.