New York: Ace Books, . First Separate Edition. Paperback. First Separate Edition, the second edition overall. Small octavo, original pictorial wrappers. Issued as Ace 51910 (95¢). Off-white paper. A fine copy. Fine. Item #311452
¶ Originally issued in 1956 as Ace D-193 backed with SPACE BORN by E.C. Tubb.