Bookmark made of flown fabric from the National Geographic Society–US Army Air Corps balloon Explorer II, 2.25 x 7, printed with an image of the balloon on one side and details of the flight on the reverse. The flight took place on November 11, 1935, and set an altitude record at a height of 72,395 feet. In very good condition, with moderate overall soiling. Accompanied by a photocopy of the type of letter sent to National Geographic Society members who received these souvenirs. The Leslie Cantwell Collection.
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