title: Classic pages in obstetrics and gynecology. Roentgen visualization of the placenta. American Journal of Roentgenology and Radiation Therapy, vol. 31, pp. 37-40, 1934.
mesh_terms: D005260:Female; D049673:History, 20th Century; D006801:Humans; D009774:Obstetrics / Q000266:history*; D010920:Placenta / Q000000981:diagnostic imaging*; D011247:Pregnancy; D011859:Radiography