430 _ 0
‡a
Data from the national vital statistics system
410 2 _
‡a
National Center for Health Statistics (U.S.).
‡t
Vital and health statistics.
‡n
Series 21,
‡p
Data from the national vital statistics system
410 1 _
‡a
United States.
‡b
National Center for Health Statistics.
‡t
Vital and health statistics :
‡n
Series 21,
‡p
Data from the National Vital Statistics System, Data on natality, marriage, and divorce
430 _ 0
‡a
Vital & health statistics.
‡n
Series 21,
‡p
Data from the national vital statistics system