Antarctica: British National Expedition 1901-04: Wrench’s ‘Links of Empire’ postcards, Series 3, three cards depicting Route and deck of the “Discovery”, Explorers and sledge and Polar bear (in error) with British flag, each with “Discovery” handstamp and sent 1901 (Oct. 7), (Dec. 24), and 1904 (Apr. 25) respectively to different subscribers. Wharton DA-2 to DA-4. Photo. (Image1)