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  Vibration Amplitudes Produced in St. David's Cathedral by Concorde Sonic Bangs - F. L. Hunt - Google Books

  https://books.google.de/books?id=rl_7oAEACAAJ&dq=inauthor:%22F.+L.+Hunt%22&hl=de&sa=X&ved=0ahUKEwi3qJ3u0-jXAhUIshQKHWGxBCIQ6AEIL

  Keine Beschreibung vorhanden.

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  Holzdorf Air Base, Germany - Military Airfield Directory

  http://www.mil-airfields.de/de/holzdorf.htm

  Keine Beschreibung vorhanden.

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  Gustave-Whitehead.com, Gustav Weißkopf, © John Brown

  http://www.gustave-whitehead.com/

  Gustave Whitehead, aviation pioneer, is now officially recognized as first in flight (powered/navigable) by aviation's highest authority, "Jane's All the World's Aircraft".

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