1st Edition - 1987 copyright, but covers through the end of 1986 (up through the Plus era, no SE or later)

2nd Edition - 1989 copyright, but includes only through SE and II (no IIx or IIcx)

3rd Edition - 1991 (the delayed System 7.0 about to hit), covers through mid-1990 (no Classic or LC yet)

4th Edition - 1992 (has System 7, Quadras, and LC II)

5th Edition - 1994 (System 7.5 is covered)

6th Edition - 1996? (Don't have this one, but I think it covered Power Macs)

7th Edition - 1998 (OS 8 )

8th Edition - 2001 (9.2.1 and 10.1)

9th Edition - 2004 (10.3)

Arthur Naiman worked on the first four. Sharon Zardetto Aker was a major contributor/editor to many of these editions as well. Dale Coleman was involved with the earlier editions. Clifford Colby and Marty Cortinas were around for the later editions, and I believe Darcy DiNucci was the principal editor of the fifth edition.