New York, Harcourt, Brace & World, 1961. First Edition. First Impression. Hardback. A near fine copy. Inscribed by the author to the front free endpaper. The inscription reads 'To Clayton Lewis / with all good wishes / Arthur C. Clarke'. A little bumping and rubbing to the spine tips and forecorners. An excellent copy overall. Cover art by Arthur Hawkins [7436, Hyraxia Books].