New York: Ace Books, Inc., 1964. Jack Gaughan and Ed Emshwiller. First edition, first printing. Paperback. Item #45091
Ace Double, book number F-275. Cover price 40¢. Cover art by Jack Gaughan and Ed Emshwiller. The usual hint of toning to the pages. Small light splash to The Duplicators cover. A very good copy which appears unread.