Characteristics of births. United States, 1973-1975.
D036861:Delivery, Obstetric; D004522:Educational Status; D005260:Female; D006801:Humans; D007086:Illegitimacy; D007231:Infant, Newborn; D008297:Male; D010290:Parents; D011247:Pregnancy; D011295:Prenatal Care; D014481:United States