A somewhat shorter version of this novel was serialized in Science Fiction Adventures (1953), under the pseudonym "Erik Van Lhin." This version restores text cut for the 1956 Avalon edition, and is a revision of the 1953 serial.
- "Original copyright 1956 by Erik van Lhin"
- "Copyright © 1975 by Random House, Inc"
- "An abridged version of this novel was published by Avalon Books, Copyright, 1956, by Erik van Linh"
- "A somewhat shorter version of this novel was serialized in Science Fiction Adventures, Copyright © 1953, by Future Publications, Inc"
- "First Printing: May, 1975"; no number line
- "Cover art by James Steranko" on copyright page, no visible signature on the artwork
- 24465 on cover, SBN on spine and copyright page; ISBN derived
- Printed in the USA
