The Mask of Cthulhu

From Author Wars - https://authorwars.com/publications/the-mask-of-cthulhu-256690.html

Overview:

Title: The Mask of Cthulhu
Author: August Derleth
Year: 1971
Publisher: Beagle Boxer
Price: $0.95
Pages: 180
Binding: Paperback
Type: Collection
Title Reference: The Mask of Cthulhu
Notes: Stated 1st printing. Introduction on unnumbered page. Cover artist credit per cthulhufiles.com, toomuchhorrorfiction.blogspot.com and conversation with artist.