Apparently the main change between this and the original Shadows of Yog-Sothoth was the product reference... and it was printed in black rather than umber ink.
Publisher's blurb: Not yet found
More when I get hold of a copy!
Book Details:
Authors: John Carnahan, John Scott Clegg, Ed Gore, Marc Hutchison, Randy McCall, Sandy Petersen, and Ted Shelton
Publishers' Reference: CHA2302
ISBN: Unknown
Paperback, 72 pages
Date: 1983
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Product page last updated: 20 January 2007