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E-book
Helicopter Flight Training: Lesson Plans for Students & Instructors with Questions Plus a Lot More
deRon NewmanE-book
The Technical, Aerodynamic & Performance Aspects of a Helicopter: A Manual for Helicopter Pilots and Engineers Who Want to Know More
deRon NewmanE-book
Aeroplane Flight Training: Lesson Plans for Students & Instructors With Questions - Plus a Lot More
deRon Newman