Stamps commemorating medicine. "Copernicus" and "the Doctors Mayo".
D001256:Astronomy / Q000266:history; D049668:History, 15th Century; D049672:History, 19th Century; D049673:History, 20th Century; D007388:Internal Medicine / Q000266:history; D010678:Philately; D011044:Poland; D014481:United States