The Apple IIGS Buyer's Guide Updates

We now have all five of the issues contributed by Mark Guerrero scanned & online.  In addition, I have gone back to most of the other issues and did more post-scanning processing to improve image quality (where possible) and reduce PDF file size.  Two issues will require a complete rescanning so that will take a while, but the rest are done.

We are still missing 3 issues, so if you come across any of those three, we would appreciate very much your contribution!