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    Re: twilight computer
    From: Dave Walden
    Date: 2009 May 31, 08:49 -0700

    My HO 216 dated 1941, has only 258 pages, and doesn't include the polar 
    navigation section.  (Off on another ebay/abebooks quest.)
    
    My AFM 51-40 dated March 1955 includes several pages on the Twilight Computer.
    
    Can gl shed any light on the evolution of HO 216, AFM 51-40, and AFP 11-216.  
    AFP 11-216 of 1 March 2001 indicates it supersedes AFM 51-40, 15 March 1983.  
    Is it just coincidence that it's 216?
    
    
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