CREATURES OF THE ABYSS. [New York]: A Berkley Medallion Book published by Berkley Publishing Corporation, . Small octavo, pictorial wrappers. First edition. Berkley Medallion G549. Aliens establish a base on Earth in the ocean depths off the Philippine coast. Reginald 08855. A fine copy. Cover art by Richard Powers. (#158015).
"BERKLEY EDITION, AUGUST, 1961" on copyright page.