00486nam a22001097a 4500999001700000245017200017260006500189300001000254650001900264942000700283952008600290 c18989d18989 aA study of infant mortality from linked records :bcomparison of neonatal mortality from two cohort studies, United States /cUS Dept. of Health, Education and Welfare aMaryland :bUS Dept. of Health, Education and Welfarec1972. a99 p. aCohort studies cRB 00104070aAIISHbAIISHd2022-07-26l0pR46r2022-07-26 00:00:00w2022-07-26yRB