Publisher: Signet #D2587, 1953, 192pgs.
Mass Market Paperback in good+ condition. Well bound, squard, with the previous owner's name written on the front free endpaper. Light creasing to the front cover and the spine, with edgewear to the covers and spine ends. " Tells the stories of a secret league of supermen, telepathic powers, a genetic engineering project, and time travel. "
