[Bookmark] / National Geographic Society, Washington, D.C. [Printed on the bookmark is a photograph of the balloon in flight and the legend "This fabric bookmark is a part of the balloon 'Explorer II' which in the service of science attained a world's altitude record of 72,395 feet above sea level on November 11, 1935". On reverse are particulars of the "flight of the National Geographic Society - U.S. Army Corps stratosphere balloon", including flight personnel]