Tunnel in the Sky
Robert A Heinlein
The Oerth Journal #10
Unknown
Dungeon Magazine 104
Heroquest-Rolepla[..] final
Kenneth Goodson
Tome and Blood: A Guidebook to Wizards and Sorcerers
Bruce R. Cordell and Skip Williams
Monster Manual
Skip Williams & Jonathan Tweet & Monte Cook
Book of Challenges: Dungeon Rooms, Puzzles, and Traps
Daniel Kaufman
Enemies and Allies
Bruce R. Cordell & Jeff Grubb & David Noonan & and Skip Williams