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Helicopter History Site
This site traces the evolution of rotary wing aircraft back to Leonardo Da Vinci.
Helicopters and Autogiros 1939 to 1945
Aviation history in the WWW: Index of aircraft by category and time period.
Igor I. Sikorsky Historical Archives, Inc.
Dedicated to acquiring, preserving and protecting the historical materials that chronicle the aviation careers of Igor Sikorsky, the companies he founded and the accomplishments of its employees.
Blueghost Green
History of this helicopter cavalry troop from the Vietnam War era of helicopters.
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