Teenage childbearing and abortion patterns--United States, 1977.
D000028:Abortion, Induced / Q000639:trends*; D000293:Adolescent; D000328:Adult; D001723:Birth Rate; D002648:Child; D003267:Contraception / Q000639:trends; D005260:Female; D006801:Humans; D011247:Pregnancy; D011253:Pregnancy in Adolescence; D014481:United States