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Antarctica--Discovery and exploration Ellsworth Lincoln 1872-1928 1880-1951 Amundsen Arctic regions Discovery & exploration Roald Arctic regions--Discovery and exploration Amundsen-Ellsworth Arctic Expedition Ice 1925 1926 Airplanes Polar regions--Discovery and exploration Amundson-Ellsworth Arctic Expedition Explorers Graf Zeppelin (Airship) Aeronautics--Flights Airships Antarctica 1871-1936 1880-1951 -- Travel -- Antarctica 1933-1935 -- Maps 1933-1936 Antarctica -- Discovery and exploration -- Maps Canada--Discovery and exploration Ellsworth Antarctica Expedition Ellsworth Transantarctic Flight Expedition