59 United States Department of Health and Human Services. National Center for Health Statistics Natality Detail File, 2005 [United States] ICPSR22960-v1
2008-08-22
2008 Inter-university Consortium for Political and Social Research (ICPSR) http://dx.doi.org/10.3886/ICPSR22960.v1 10.3886/ICPSR22960.v1