The Ennead

From Author Wars - https://authorwars.com/publications/the-ennead-287684.html

Overview:

Title: The Ennead
Author: Jan Mark
Year: 1978
ISBN-10: 0690038720
Publisher: Thomas Y. Crowell
Price: $7.95
Pages: 306
Binding: Hardcover
Type: Novel
Title Reference: The Ennead
Notes:
- Library binding ISBN is 0-690-03873-9
- Stated "First edition". But it also says "First American edition. Published in Great Britain, 1978, by Kestrel Books". It's not immediately obvious what the precedence is between this two editions.