NOBEL PRIZE WINNERS: An excellent multiple signed commemorative cover issued in honour of the Mayo Brothers and featuring a postage stamp with their images, post marked at Rochester, Minnesota, 1^st September 1964, individually signed by ten Nobel Prize winners in Physiology or Medicine comprising John Franklin Enders (1897-1985, American biomedical scientist, known as 'The Father of Modern Vaccines', Nobel Prize winner in Physiology or Medicine, 1954), Frederick Chapman Robbins (1916-2003, American paediatrician and virologist, Nobel Prize winner in Physiology or Medicine, 1954), Thomas Huckle Weller (1915-2008, American virologist, Nobel Prize winner in Physiology or Medicine, 1954), Andre Frederic Cournand (1895-1988, French-American physician and physiologist, Nobel Prize winner in Physiology or Medicine, 1956), George Beadle (1903-1989, American geneticist, Nobel Prize winner in Physiology or Medicine, 1958), Edward Tatum (1909-1975, American geneticist, Nobel Prize winner in Physiology or Medicine, 1958), Arthur Kornberg (1918-2007, American biochemist, Nobel Prize winner in Physiology or Medicine, 1959), John Eccles (1903-1997, Australian neurophysiologist and philosopher, Nobel Prize winner in Physiology or Medicine, 1963), Charles Brenton Huggins (1901-1997, Canadian-American physician, physiologist and cancer researcher, Nobel Prize winner in Physiology or Medicine, 1966) and Max Delbruck (1906-1981, German-American biophysicist, Nobel Prize winner in Physiology or Medicine, 1969). All have signed with their names alone in various coloured inks to clear areas of the cover. Only a couple of the signatures are very slightly affected by the postal cancellation. About VG