Running through several printings, although this bears the name Gary Gygax's own campaign world, it actually is a rules expansion. It contains new character classes (Paladin & Thief), new spells, treasure, and combat rules.
More when I get hold of a copy!
Book Details:
Authors: Gary Gygax and Rob Kuntz
Publishers' Reference: TSR2003
ISBN: Unknown
Paperback, 68 pages
Date: March 1975
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Product page last updated: 6 February 2016