Bell Aircraft: Perbedaan antara revisi
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* Pelletier, Alan J. ''Bell Aircraft Since 1935''. Annapolis, Maryland: Naval Institute Press, 1992.
*http://www.flightglobal.com/news/articles/in-focus-bell-helicopter-primes-xworx-amarillo-for-relentless-368826/
*http://www.chillicothecity.org/press_lifeflight.html
*
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