Howard's Whirlybirds : Howard Hughes' Amazing Pioneering Helicopter Exploits
Donald J. Porter | inglese | copertina rigida | 240 p. | 2013
Hughes HK-1 (H-4) Flying Boat Manual
U.S. War Department | inglese | brossura | 170 p. | 2009
AH-64 Apache Attack Helicopter
Headquarters Department of the Army | inglese | brossura | 656 p. | 2011
The Apache in European Service
Darren Willmin | inglese | brossura | 96 p. | 2016