Petersen's Field Guide to Cthulhu Monsters

From Author Wars - https://authorwars.com/publications/petersens-field-guide-to-cthulhu-monsters-607426.html

Overview:

Title: Petersen's Field Guide to Cthulhu Monsters
Author: Lynn Willis, Tom Sullivan, Sandy Petersen
Year: 1988
ISBN-10: 0933635486
Publisher: Chaosium
Price: $15.95
Pages: 64
Binding: Trade Paperback
Type: Non-fiction
Title Reference: Petersen's Field Guide to Cthulhu Monsters
Notes: Unknown