A study of infant mortality from linked records : by birth weight, period of gestation, and other variables, United States, 1960 live-birth cohort : mortality experience of the 1960 live-birth cohort during the first year of life, by birth weight, period of gestation, age of mother, color, sex, plurality, and age at death.
Rockville, Md. : National Center for Health Statistics,
1972.
Infants