The Ultimate Enemy

From Author Wars - https://authorwars.com/publications/the-ultimate-enemy-286659.html

Overview:

Title: The Ultimate Enemy
Author: Fred Saberhagen
Year: Unknown
ISBN-10: 0441843166
Publisher: Ace Books
Price: $2.25
Pages: 242
Binding: Paperback
Type: Collection
Title Reference: The Ultimate Enemy
Notes: Stated 3rd printing as per number line. Back cover asserts first publication.