The X Factor, Ace G-646


Published by Ace, 1967; no ISBN; Ace G-646; 158 pages; 4.2 x 7.0 inches; paperback. Cover art by Jack Gaughan.

Copyright 2007-2021 by Mike Grimm; cover images are copyrighted by their respective owners, are used here for illustrative purposes only, and are scans of my copies.