title: The legitimacy status of first births to U.S. women aged 15-24, 1939-1978.
mesh_terms: D000029:Abortion, Legal; D000293:Adolescent; D000328:Adult; D001723:Birth Rate; D005260:Female; D005298:Fertility; D006801:Humans; D007086:Illegitimacy / Q000639:trends*; D008393:Marriage; D014481:United States