title: Classic pages in obstetrics and gynecology. Theodor Langhans: Untersuchungen über die menschliche Placenta. 1877.
mesh_terms: D005260:Female; D005858:Germany; D006176:Gynecology / Q000266:history*; D049672:History, 19th Century; D006801:Humans; D009774:Obstetrics / Q000266:history*; D010920:Placenta / Q000166:cytology*; D011247:Pregnancy; D013557:Switzerland