World's Fastest Four-Engine Piston-Powered Aircraft - Republic's XR-12 Rainbow & the Hughes XF-11
English | paperback | 144 p. | 2011
Howard's Whirlybirds : Howard Hughes' Amazing Pioneering Helicopter Exploits
English | hardback | 240 p. | 2013
AH-64 Apache Units of Operations Enduring Freedom and Iraqi Freedom
English | paperback | 96 p. | 2005