New York, Doubleday, 1955. First edition, first impression. Hardback. A very good copy. An important Asimov novel. A couple of closed tears, the longest to the rear fold (~30mm). A little edge wear elsewhere but nice overall. Some bumping to the spine tips, and a little rubbing. Collector's plate to the front pastedown. Cover art by Mel Hunter [11070, Hyraxia Books].