Past Master

From Author Wars - https://authorwars.com/publications/past-master-25693.html

Overview:

Title: Past Master
Author: R. A. Lafferty
Year: 1982
ISBN-10: 0441653030
Publisher: Ace Books
Price: $2.50
Pages: 248
Binding: Paperback
Type: Novel
Title Reference: Past Master
Notes:
"This Ace printing: July 1982" The number line reads "2 4 6 8 0 9 7 5 3 1" [but is the fourth printing]. "Published simultaneously in Canada". Cover art not credited and there is no visible signature on the artwork.