1. Helicopter History Site - This site traces the evolution of rotary wing aircraft back to Leonardo Da Vinci. 2. All the World's Rotorcraft - Provides pictures and background from the first designs to current machines. Also offers dictionary and links to related resources. 3. Blueghost Green - History of this helicopter cavalry troop from the Vietnam War era of helicopters. 4. Helicopters and Autogiros 1939 to 1945 - Aviation history in the WWW: Index of aircraft by category and time period. 5. 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.

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