A Study of Infant Mortality from Linked Records : By Birth Weight,Period of Gestation, and Other Variables,United States
O20889
90 p. - (Vital and Health Statistics.Series 20: Data from the National Vital Statistics System, no. 12 ) US
O20889
90 p. - (Vital and Health Statistics.Series 20: Data from the National Vital Statistics System, no. 12 ) US