Estimated Pregnancy Rates and Rates of Pregnancy Outcomes for the United States, 1990–2008. NVSR Volume 60, Number 07. 22 pp. (PHS) 2012-1120.
National Vital Statistics Reports from the National Center for Health Statistics, Centers for Disease Control and Prevention (CDC). The following report has been added recently: Estimated Pregnancy Rates and Rates of Pregnancy Outcomes for the United States, 1990-2008
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