Zephyr HALE UAS (High Altitude Long Endurance Unmanned Aerial System)
X-HALE: Designing the Atmospheric Surveillance Platforms of the Future
X-43A: The First Flight of a Scramjet Powered Airplane
Wings of the Finest Hour: Evolution of the Supermarine Spitfire
Winged Shield, Winged Sword: A History of the United States Air Force. Volume 1, 1907-1950