The Caproni "90 P.B." Military Airplane (Italian), A Giant Biplane of 6000 Horsepower. National Advisory Committee for Aeronautics, Washington, 1930. 9pp, illus with drawings and photos, 8.5x11", blue paper cover, stapled. Good; cover edge chips,tape over staples and light library stamps. At the time of the first flight in 1929, this Caproni was the world's largest airplane!