New York, Gnome Press, 1950. First edition, first impression. Hardback. A very good copy. A highlight of science fiction. Inscribed by the author ?To Jane, best wishes, Isaac Asimov 13 April 1976? on the half-title. Some very mild damp staining to cloth with a little white paper from jacket verso adhering in places, some splash marks to edges of text block, but a sound and internally clean copy, the price-clipped jacket sunned to spine as usual, only a little rubbed at ends and corners, and one area of abrasion to upper front joint fold with a mark nearby, still a highly presentable copy in an unrestored jacket, very good. [9267, Hyraxia Books].