Another possibility is that some authors and small-time publishers
might have backups of the original files used to create the magazine.
Back in the late 80s, I was tech editor for Amazing Computing,
an Amiga publication. I was a frequent contributor to AmigaWorld,
a columnist for Compute, and various other magazines (a handful of
video magazines, Verbum, Byte, etc.) Given my pack rat genes,
I think I have every article on disk. Perhaps other authors are
the same way. Entire books could be rescued this way. On the
other hand, an author friend of mine who did a seminal book
about programming the C-64 had written the book on his Atari,
and eventually threw away the disks years after publication.
Amazing's publisher,
www.pimpub.com is supposedly still online
but the web seems down right now but here's the reg info
(
http://206.117.147.98/getwho.cgi?dom=PIMPUB.COM).
He used Macs and Quark, and might have original files, too.
Of course, the reality for most magazines is that most ads
are stripped in photographically, not electronically.
- John