The National Geographic Society - U.S. Army Air Corps Stratosphere Flight of 1935 in the Balloon "Explorer II". Washington D.C., 1936. Sm4to, 8x10", 277 pages, hardcover bound in blue buckram, front cover stamped in gold with the title and "Property of 1st Balloon Squadron". Inside on title page is a receiving stamp dated Mar 1937 for the 1st Balloon Co. library. Pocket inside back cover contains excerpt from the article announcing the flight and the large inflight photograph, about 16x24", four-fold. Cover has edge bumps, spine faded, else very good.