World's Fastest Four-Engine Piston-Powered Aircraft - Republic's XR-12 Rainbow & the Hughes XF-11
Mike Machat | Engels | softcover | 144 blz | 2011
Howard's Whirlybirds : Howard Hughes' Amazing Pioneering Helicopter Exploits
Donald J. Porter | Engels | hardcover | 240 blz | 2013
AH-64 Apache Attack Helicopter
Headquarters Department of the Army | Engels | softcover | 656 blz | 2011
AH-64 Apache Units of Operations Enduring Freedom and Iraqi Freedom
Jonathan Bernstein | Engels | softcover | 96 blz | 2005