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. 1935 May;20(3):250–258. doi: 10.1093/genetics/20.3.250
Human Twinning in the United States: Racial Frequencies, Sex Ratios, and Geographical Variations
G W D Hamlett
1
G W D Hamlett
1Harvard Medical School, Harvard University, Boston, Massachusetts
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1Harvard Medical School, Harvard University, Boston, Massachusetts
Received 1934 Jul 16.
PMCID: PMC1208584 PMID: 17246757