title: Williams Obstetrics on abortion.
mesh_terms: D000022:Abortion, Spontaneous; D004992:Ethics, Medical / Q000266:history; D005260:Female; D049673:History, 20th Century; D006801:Humans; D009774:Obstetrics / Q000266:history; D011247:Pregnancy; D012014:Reference Books, Medical; D014481:United States