Dark & Twisty

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Are you John Heilborn, author of the books below?
Commodore 128 by John Heilborn Compute's Reference Guide to Commodore 64 Graphics by John Heilborn Your Commodore 128 by John Heilborn MacIntosh notebook by John Heilborn Atari S. T. User's Guide by John Heilborn Windows 3.0 illustrated quick tutorial by John Heilborn Programming the Atari st by John Heilborn Science and Engineering Programs Apple II Edition by John Heilborn VIC 20 User Guide by John Heilborn Macintosh Notebook by John Heilborn


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