Childspacing (Volume II, Part III - Subject Reports)
citation:
U.S. Bureau of the Census. U.S. Census of Population: 1960. Subject Reports, Childspacing. Final Report PC(2)-3B. U.S. Government Printing Office, Washington, D.C. 1968.
U.S. Bureau of the Census. U.S. Census of Population: 1960. Subject Reports, Childspacing. Final Report PC(2)-3B. U.S. Government Printing Office, Washington, D.C. 1968.