Vital and health statistics: Series 3, Analytical studies. 4. Infant and perinatal mortality in United States, analysis of long and shortterm trends in infant mortality in United States by age at death, cause of death, sex of child, color, and geographic area, fetal and perinatal mortality trends, role of various risk factors including birth weight, age of mother, birth order, mother's history of prior pregnancy loss, changes during 1950 decade in personnel and facilities and services related to obstetrical and pediatric care, discussion of health insurance and maternal and child health programs and services [with list of references; by Sam Shapiro, Edward A. Schleslnger, and Robert E. L. Nesbltt, jr.]

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