Helicopters 1900-1960 Civil Helicopters Boeing Helicopters CH-47 Chinook Illustrated History of Helicopters Helicopter Directory Helicopter Book Lock on no 13 Aircraft Photo File, AH-64A Apache Attack Helicopter illustrated guide to Military Helicopters Vietnam Helicopter Handbook Helicopters at war, a pictorial history Helicopter; History, Piloting and how it Flies Dragonflies; The Story of Helicopters and Autogiros
