430 _ 0
‡a
Data from the national survey of family growth
410 2 _
‡a
National Center for Health Statistics (États-Unis)
‡t
Vital and health statistics.
‡n
Series 23,
‡p
Data from the national survey of family growth
410 2 0
‡a
National Center for Health Statistics (U.S.).
‡t
Vital and health statistics.
‡n
Series 23,
‡p
Data from the national survey of family growth
410 1 _
‡a
United States.
‡b
National Center for Health Statistics.
‡t
Vital and health statistics :
‡n
Series 23,
‡p
Data from the National Survey of Family Growth
410 1 0
‡a
United States.
‡b
National Center for Health Statistics.
‡t
Vital and health statistics :
‡n
Series 23,
‡p
Data from the National Survey of Family Growth
430 _ 0
‡a
Vital & health statistics.
‡n
Series 23,
‡p
Data from the national survey of family growth