Notes: First hardcover edition. [Currey] "Shorter and substantially different versions of the three sections of this novel were published separately in Science Fiction Adventures © 1962 by Nova Publications, Ltd., London." The three sections, with numberous minor alterations, were published in book form and copyright © 1962 by Ace Books, Inc., New York. "The present completely revised and considerably expanded text is copyright © 1969 and 1974 by Brunner Fact and Fiction, Ltd." on copyright page. No printed price, price from The Whole Science Fiction Data Base No. 4. "Jacket design by Josh Kirby" on front flap of dustwrapper.