1969. First Sphere Books Edition. 223 pages. Pictorial paper cover. Pages are lightly tanned and foxed throughout. Cracking to hinges with covers slightly coming away from text-block. Occasional thumb-marking present. Binding remains firm. Paper cover has mild edge wear with scuffing to edges and creasing. Book has rolled spine. Light sunning to spine and edges. Mild rubbing to surfaces with curling to corners.