Architects of air power first aviators giant airships Early airplanes soviet air force War in the air : aerial wonders of our time Flying machines : the picture of the men, women and machines which first conquered space Air forces of the world : an illustrated directory of all the world's military air powers Aircraft aircraft Air power : a Concise History sky their frontier : the Story of the World's Pioneer Airlines and Routes 1920-1940 story of aircraft : seven decades of powered flight