Wall of Serpents

From Author Wars - https://authorwars.com/publications/wall-of-serpents-231165.html

Overview:

Title: Wall of Serpents
Author: L. Sprague de Camp, Fletcher Pratt
Year: 1960
Publisher: Avalon Books
Price: $2.95
Pages: 223+[30]
Binding: Hardcover
Type: Collection
Title Reference: The Wall of Serpents
Notes:
No statement of printing on copyright page. Presented as a single novel,The Wall of Serpents as chapters 1-8, The Green Magician as chapters 9-18. The last 30 pages are Chapters I and II of Murder at Auction by Elizabeth Beatty as an advertisement. "Jacket design by Ed Emshwiller" on front dust jacket flap. Art matches his style, so crediting as artist.