Series:
Advance data from vital and health statistics of the National Center for Health Statistics - no. 3DHEW publication - no. (HRA) 77-1250DHEW pub - no. (HRA) 77-1250Series:
Advance data from vital and health statistics of the National Center for Health Statistics - no. 9DHEW publication - no. (HRA) 77-1250DHEW pub - (HRA) 77-1250Series:
Advance data from vital and health statistics of the National Center for Health Statistics - no. 10DHEW publication - no. (HRA) 77-1250DHEW pub - (HRA) 77-1250Series:
Advance data from vital and health statistics of the National Center for Health Statistics - no. 11DHEW publication - no. (HRA) 77-1250DHEW pub - (HRA) 77-1250