This article is from the Aviation FAQ, by Geoffrey G. Peck geoff@peck.com with numerous contributions by others.
Copyright (C) 1990-1999, Geoffrey G. Peck, all rights reserved.
You may redistribute this information freely as long as it is distributed in
its entirety, with this copyright notice included. You may also not charge,
either directly or indirectly, for this information, nor may you include this
information in a compendium for which a charge of any sort is made.
 
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