Changeling

From Author Wars - https://authorwars.com/publications/changeling-475196.html

Overview:

Title: Changeling
Author: Roger Zelazny
Year: Unknown
ISBN-10: 0441102573
Publisher: Ace Books
Price: $2.50
Pages: 272
Binding: Paperback
Type: Novel
Title Reference: Changeling
Notes:
- Undated second printing that states "First Ace printing: June 1980" / "First mass market edition: April 1981" / "246809753" / "Manufactured in the United States of America"
- Internal illustrations credited to Esteban Maroto.
- Cover not credited, no signature on this version of the cover, but this cover is trimmed from the SFBC cover, which clearly shows the artist's signature.
- The cover shown is of the first printing. The second printing's cover is the same except the words "First Mass Market Edition" have been removed.