Lot 1025Arctic: 1931 Wilkins-Ellsworth Trans-Arctic Submarine Expedition covers from Norway x2 - one registered & signed "Hubert Wilkins" - with 'LONGYEARBYEN' cds and from Great Britain x2 both signed, the registered one also by "Sloan Danenhower" Commander of the 'Nautilus' submarine, plus 1938 Greenland Expedition postcard with 'NORDOSTGRONLANDSEKSPEDITION' cancel and a few US & Australian polar flights. (11)