New York: Ace Books, Inc. , 1962. First edition. Hardcover. Small 8vo. , 5-158,  (pages of publisher's advertisements); , 5-97 pp. Decorative covers with a blue and red spine lettered in white. An Ace Double Paperback with a price of 40 cents on each cover. Canja 88. Currey 11. The first book publication of both works. A nice example of an Ace Science Fiction Double. Very Good. Item #00009953
Notable toning to the pageblock and minor wear to the extremities.