I was a Mac beta tester back in '83, and still have a copy of the pre-release "Inside Macintosh" mimeographed the day after the original programmers wrote their drafts, filled with penciled in corrections and in some places pages of hand corrected notes. Reviewing a formal copy after edition 2 or 3, I was surprised to see a reduction in information quality and some of the key information from the penciled in notes completely missing.
The original Inside Mac was 3 volumes, after their initial printing of the "phone book edition" - all three volumes in one thick soft spine binder.
I really need to take the time to scan my copy and put it online. It's got ballpoint pen corrections from the Apple Engineers telling the beta testers various fixes.