All I can tell you about this list it's from the 1995 Prima guide to Discworld, but it is complete.
3DO Game Guide
The 7th Guest: The Official Strategy Guide
Armored Fist: The Official Strategy Guide
Alone in the Dark 3: The Official Strategy Guide
Betrayal at Krondor: The Official Strategy Guide
Blackthrone: The Official Strategy Guide
Breath of Fire Authorized Game Secrets
Complete Final Fantasy III Forebidden Game Secrets
Cyberia: The Official Strategy Guide
Descent: The Official Strategy Guide
Donkey Kong Country Secrets The Unauthorized Guide
Doom Battlebook
Doom II: The Official Strategy Guide
Dragon Lore: The Official Strategy Guide
EA Sports Official Power Play Guide
Earthworm Jim Official Game Secrets
Front Page Sports Football Pro '95 The Official Playbook
Harpoon II: The Official Strategy Guide
Hell: A Cyberpunk Thriller - The Official Strategy Guide
Heretic: The Official Strategy Guide
King's Quest VII: The Official Strategy Guide
The Legend of Zelda: A Link to the Past - Game Secrets
Lode Runner: The Legends Returns - The Official Strategy Guide
Lord of the Rings Official Game Secrets
Machiavelli: The Prince: Official Secrets and Solutions
Master of Orion: The Official Strategy Guide
Master of Magic: The Official Strategy Guide
Maximum Carnage Offical Game Secrets
Microsoft Flight Simulator: The Official Strategy Guide
Microsoft Golf: The Official Strategy Guide
Microsoft Space Simulator: The Official Strategy Guide
Might and Magic Compendium: The Authorized Strategy Guide for games 1,2,3 and 4
Mortal Kombat II Official Power Play Guide
Myst: The Official Strategy Guide
NBA Jam: The Official Poer Play Guide
Outpost: The Official Strategy Guide
Pagen: Ultima VIII - The Ultimate Strategy Guide
The Pagemaster : Official CD-ROM Strategy Guide
Panzer General: The Official Strategy Guide
Rebel Assault: The Official Insider's Guide
Return to Zork Adventurer's Guide
Secret of Mana Official Game Secrets
Sherlock Holmes, Consulting Detective : The Unauthorized Strategy Guide
Sid Meier's Civilization, or Rome on 640K a Day
Sid Meier's Colonization: The Official Strategy Guide
SimCity 2000: Power, Politics, and Planning
Sim Tower: The Vertical Empire
Star Crusader: The Official Strategy Guide
Strike Commander: The Official Strategy Guide and Flight School
Super Empire Strikes Back Official Game Secrets
Super Mario World Game Secrets
Super NES Games Unauthorized Power Tips Guide Volume 1 and 2
Super Star Wars Official Game Secrets
TIE Fighter: The Official Strategy Guide
TurboGrafix-16 and TurboExpress Secrets, Volume 1
Urban Strike Oficial Power Play Guide, with Desert Strike & Jungle Strike
Under The Killing Moon: The Official Strategy Guide
Virtual Bart Offical Game Secrets
WarCraft: Orc's and Humans Official Secrets and Solutions
Wing Commander III: The Ultimate Strategy Guide
X-Com UFO Defense: The Official Strategy Guide
X-Wing: The Official Strategy Guide
I can tell you a great place to find old game guides...check out any used book stores.