@book{285743,
	author = {Kovar, Mary Grace, and National Center for Health Statistics (U.S.),},
	title = {Variations in birth weight :},
	publisher = {U.S. Department of Health, Education, and Welfare, Public Health Service, Health Services and Mental Health Administration,},
	year = {1968.},
	series = {Vital and health statistics. Series 22, Data from the national vital statistics system ;},
	address = {Washington, D.C. :},
	note = {"Statistics on the variation in birth weight according to whether or not the mother was employed during pregnancy, 1962 family income, the time of the first visit for medical care and the number of visits during the 12 months preceding childbirth. Based on data collected by a questionnaire mailed to mothers and medical care services for a sample selected from records of births in 1963 which filed with the National Center for Health Statistics."},
	url = {https://purl.fdlp.gov/GPO/gpo106555}
}