Slaves of the Unknown

From Author Wars - https://authorwars.com/books/slaves-of-the-unknown-2218648.html

Overview:

Title: Slaves of the Unknown
Author: uncredited
Year: 1942
Type: Interior Art

Editions/Publications:

Unknown. Astonishing Stories (Canadian), May 1942 (Unknown, uncredited, Popular Publications, Inc.; Toronto, Canada, C$0.10, 100 pages, pulp, MAGAZINE)