American Helicopter Museum & Education Center
The transport museum focuses on the history, science and technology of rotary wing aviation. The collection contains over 40 civilian and military autogyros, convertiplanes and helicopters, including some early generation models. The museum also has an extensive research library, the Renzo Pierpaoli Memorial Library, which contains documents, artifacts, films, and memoirs that museum members can use.
The website includes a short history of helicopters, which were introduced in the first two decades of the 20th century. The location is near Philadelphia.