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A comment on Divergence in U.S. Sex Ratios by County, 1820–2010. Parent comment

Re:Divergence in U.S. Sex Ratios by County, 1820–2010 by ginko on Thursday May 07, 2015 @03:33PM (#9507668)
It was a combination of WW2 and penicillin severely reducing the mortality rate of childbirth.
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