Black Legion of Callisto

From Author Wars - https://authorwars.com/publications/black-legion-of-callisto-112941.html

Overview:

Title: Black Legion of Callisto
Author: Lin Carter
Year: 1975
ISBN-10: 0860078256
Publisher: Orbit / Futura
Price: £0.45
Pages: 203
Binding: Paperback
Type: Novel
Title Reference: Black Legion of Callisto
Notes:
"First published in Great Britain in 1975" Printing not stated, no number line No cover artist credit or visible signature but the artwork is shown on Bruce Pennington's official site. 45p in UK, $1.50 in Australia & New Zealand