Text on back: "Boeing B-52 Stratofortress over the cascades
This new stratofortress and its civilian counterpart, the 707, is the
ultimate in modern jet aviation. Being built in Seattle & Renton,
Wasgington, this sleek, flying beauty has eight turbojet engines, a
wing span of 185 ft (56.39 m), weighs 175 tons, and a ceiling of more than
50,000 ft (15,000 m)."