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keywords:(helicopter)
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HELICOPTERS
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keywords:(HELICOPTERS)
The helicopter : an illustrated history of rotary-winged aircraft
Airworthiness : an introduction to aircraft certification and operations
Göttinger monograph N: German research and development on rotary wing aircraft (1939 - 1945)
Airworthiness : an introduction to aircraft certification
Helicopter flight dynamics : the theory and application of flying qualities and simulation modeling
Chopper : firsthand accounts of helicopter warfare World War II to Iraq
Aircraft and rotorcraft system identification : engineering methods with flight-test examples
Whirlybirds : a history of the U.S. helicopter pioneers