VITAL AND HEALTH STATISTICS,Ser.22, 191.755 nr. 14. INFANT Infant mortality rates: Socioeconomic factors.United States.Statistics on infant mortality rates according to race, sex, famil; income,education of mother,and education of father.Based on data ... Rockville 1972 U.S.Department of Health, Education,and Welfare.Public Health Service 40 s. III, nlb.1, 68, ilustr. Vital and Health Statistics,Ser.22 nr 14 Data from the National Vital Statistics System.