Uncaged: Faces of Sigil (Planescape Accessory), by R. V. Vallese
The Inner Planes (AD&D/Planescape), by Cook, Monte
In the Abyss (Advanced Dungeons & Dragons, 2nd Edition), by Williams, Skip
The Deva Spark (Advanced Dungeons & Dragons/Planescape), by Slasbury, J. M., Slavicsek, Bill
Tales from the Infinite Staircase (AD&D/Planescape Adventure), by Cook, Monte
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