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Bell X-1The Bell X-1, the first aircraft to break the sound barrier, 1947. (Photo by Keystone/Hulton Archive/Getty Images)
Nadars BalloonNadars giant air balloon over Paris, 1863. (Photo by Hulton Archive/Getty Images)
Great 20th Century ExplorersThe semi-rigid N-class airship Norge (Norwegian for Norway ), which was used by the Amundsen-Ellsworth-Nobile Expedition to fly over the North Pole, lands on a snowy field, Teller, Alaska, May 13
Great 20th Century ExplorersThe ill-fated semi-rigid N-class airship N1 (aka Italia ) makes a stopover at an airfield before continuing on with Italian general Umberto Nobiles second expedition to overfly the North Pole, Stolp
