Vital and health statistics: Series 21, Data from National Vital Statistics System. 4. Weight at birth and survival of newborn by geographic divisions and urban and rural areas, United States, early 1950, statistics derived from vital records on neonatal mortality by weight at birth, by color and sex, for infants born in United States, during first 3 months of 1950, by geographic divisions and by urban and rural areas: [by Jeanne Unger].