The Edge of Forever

From Author Wars - https://authorwars.com/publications/the-edge-of-forever-288052.html

Overview:

Title: The Edge of Forever
Author: Chad Oliver
Year: Unpublished
ISBN-10: 0820250309
Publisher: Charter House
Price: $4.95
Binding: Hardcover
Type: Collection
Title Reference: The Edge of Forever: Classic Anthropological Science Fiction
Notes: This was listed in Locus #216 (November 1978) as announced but "not seen". Research has shown that it was never published.