Prince of Darkness

From Author Wars - https://authorwars.com/publications/prince-of-darkness-487546.html

Overview:

Title: Prince of Darkness
Author: Ray Russell
Year: 1980
ISBN-10: 0722175558
Publisher: Sphere
Price: £0.90
Pages: 157
Binding: Paperback
Type: Collection
Title Reference: Incommunicado
Notes: Data from Worldcat. WorldCat claims that this is the same as the 1971 collection, so the contents have been cloned from that edition. Contents' page numbers from ebay.com photo; two stories, "The Black Elixir" and "The Long Night", are under the group title "The Exploits of Argo". Other prices on back cover: Australia $3.25, Malta 90¢.