New York, Scribners, 1958. First Edition. First Impression. Hardback. A fine copy. First edition (the story was also published in the Magazine of F&SF in three parts, with the first part preceding the book). A lovely copy with just a little wear to the spine tips, and some splashing to the jacket interior. A little marking to the boards. Overall a very presentable copy. Cover art by Ed Emshwiller [8873, Hyraxia Books].