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  1. 1
    Three decades of twin births in the United States, 1980-2009 /
    by Martin, Joyce A., M.P.H
    Published 2012
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    Government Document eBook
  2. 2
    Births in the United States, 2014 /
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    Government Document eBook
  3. 3
    Births in the United States, 2013 /
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    Government Document eBook
  4. 4
    Births in the United States.
    Published 2014
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    Government Document Serial
  5. 5
    Health and demographic characteristics of twin births : United States, 1988 /
    by Taffel, Selma
    Published 1992
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    Government Document eBook
  6. 6
    Is twin childbearing on the decline? : twin births in the United States, 2014-2018 /
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    Government Document eBook
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