The Williamson Effect

From Author Wars - https://authorwars.com/publications/the-williamson-effect-50014.html

Overview:

Title: The Williamson Effect
Author: Roger Zelazny
Year: 1997
ISBN-10: 0312863950
Publisher: Tor
Price: $15.95
Pages: 349
Binding: Trade Paperback
Type: Anthology
Title Reference: The Williamson Effect
Notes: No trustable date on book (the "First edition May 1996" on copyright page is probably a leftover from the HC).
Artist not credited.
Month and artist from Locus.