U.S. Dept. of Health, Education, and Welfare, Public Health Service, Health Resources Administration, National Center for Health Statistics1976-<E1-130>
Dept. of Health, Education, and Welfare, Public Health Service, Health Resources Administration, National Center for Health Statistics.1974.<EG215-196>
U.S. Dept. of Health, Education, and Welfare, Public Health Service, Health Resources Administration, National Center for Health Statistics1976-<EG215-314>