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A Guide to the Astral Plane (AD&D/Planescape), by Monte Cook
A Guide to the Ethereal Plane (AD&D/Planescape), by Cordell, Bruce R.
Eternal Boundary (Planescapes Adventure), by
Harbinger House (AD&D/Planescape Adventure), by Slavicsek, Bill
Hellbound: The Blood War (AD&D/Planescape), by Monte Cook, Colin McComb
In the Abyss (Advanced Dungeons & Dragons, 2nd Edition), by Williams, Skip
Monstrous Compendium Appendix (Planescape) (Advanced Dungeons & Dragons, 2nd Edition, Accessory/2602), by
Monstrous Compendium Appendix II (Planescape) (Advanced Dungeons & Dragons, 2nd Edition, Accessory/2613), by Rich Baker
On Hallowed Ground (Advanced Dungeons & Dragons: Planescape, Deluxe Campaign Accessory/2623), by Colin McComb
Planes of Chaos (Advanced Dungeons & Dragons, 2nd Edition: Planescape, Campaign Expansion/2603), by Wolfgang Baur, Lester Smith
Tales from the Infinite Staircase (AD&D/Planescape Adventure), by Cook, Monte
The Planewalkers Handbook (AD&D/ Planescape), by Monte Cook
The Well of Worlds (Advanced Dungeons & Dragons : Planescape Adventures, 2604 Book and Poster Sized Map), by McComb, Colin
Uncaged: Faces of Sigil (Planescape Accessory), by R. V. Vallese