New York, Doubleday, 1952. First edition, first impression. Hardback. A near fine copy. The third (published) in Asimov's [Galactic] Empire series. An early work and a classic of the genre. Some light rubbing to the jacket, jacket spine tips and front fold taped to the interior, fixing a couple of tears. Owner's inscription to front pastedown. Cover art by George Guisti [9211, Hyraxia Books].