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Premarital Fertility

Wilson H. Grabill

出版	U.S. Department of Commerce, Bureau of the Census, 1976
URL	http://books.google.com.hk/books?id=DAXZaLykcvMC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN

註釋

Births while single, births conceived before first marriage, births conceived after first marriage.