Helicopter History Site  
   This site traces the evolution of rotary wing aircraft back to Leonardo Da Vinci.
   http://www.helis.com

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.
   http://www.sikorskyarchives.com//

Helicopter Museum  
   Unique collection of helicopters along with volunteers working on the restoration of the aircraft.
   http://www.geocities.com/CapeCanaveral/Cockpit/2996/

Blueghost Green  
   History of this helicopter cavalry troop from the Vietnam War era of helicopters.
   http://members.aol.com/BluGhstGrn/odgreen.html

Helicopters and Autogiros 1939 to 1945  
   Aviation history in the WWW: Index of aircraft by category and time period.
   http://www.luftfahrtmuseum.com/htmi/itk/h4.htm

All the World's Rotorcraft  
   Provides pictures and background from the first designs to current machines. Also offers dictionary and links to related resources.
   http://avia.russian.ee/

Helicopter History  
   A brief history of the evolution of helicopters.
   http://www.flying-bike.fsnet.co.uk/helistuff/heli.html