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Declines in triplet and higher-order multiple births in the United States, 1998-2014

Martin, Joyce A., author.
Hyattsville, MD : U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, National Center for Health Statistics, 2016. 2016

Is twin childbearing on the decline? : twin births in the United States, 2014-2018

Martin, Joyce A., author.
Hyattsville, MD : U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, National Center for Health Statistics, 2019. 2019