New York, Gnome Press, 1949. First Edition. First Impression. Hardback. A near fine copy. First published over three issues of Astounding in 1951 (as Anson MacDonald). Based to some extent on an unpublished John W. Campbell work. The jacket is complete and unfaded, there is some pushing to the spine tips and a little associated creasing and rubbing. Overall, the book presents very well. Better than most copies we've seen. [Currey, p193]. Cover art by Edd Cartier [7912, Hyraxia Books].