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Science 17 September 1993:
Vol. 261. no. 5128, p. 1508
DOI: 10.1126/science.261.5128.1508-a
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Corrections and Clarifications

Reference 4 in the article "Demic expansions and human evolution" by L. L. Cavalli-Sforza et al. (29 Jan., p. 639) was incorrect. It should have read as follows: "F. Weidenreich, Evolution 1, 221 (1947); C. Coon, The Living Races of Man (Knopf, New York, 1965); M. H. Wolpoff, in (2), pp. 62-108."

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Science. ISSN 0036-8075 (print), 1095-9203 (online)