National Center for Health Statistics (U.S.). Division of Health Resources Statistics.
Rockville, Md. : U.S. Dept. of Health, Education, and Welfare, Public Health Service, Health Services and Mental Health Administration, [1971]
1971
Sirrocco, Al.
[Hyattsville, Md.] : [U.S. Dept. of Health and Human Services, Public Health Service, National Center for Health Statistics], [1985]
1985