PICTURE CREDITS
Cover-W. W. Hubbs, Sikorsky Aircraft; 33-Aerojet-General; 34-Sud Aviation; 40, 41-Douglas; 45-United; 49-Pratt & Whitney; 55-General Dynamics/Astronautics; 56, 57-NASA; 73-Saab; 77-Lockheed; 71Hunting Aircraft, Ltd.; 79-BoeinglVertol; 81-de Havilland; 85, 87, 95, 89-Sikorsky Div., United Aircraft Corp.; 99-Boeing; 105, 107, 109, 111-Sperry Gyroscope; 116, 117-Wren; 116 (bot. right), 117 (bot.), 121-Erwin J. Bulban.