1968. Eleventh Impression. 217 pages. Pictorial paper cover. Contains black and white illustrated plates. Pages are lightly tanned and foxed throughout. Occasional thumb-marking present. Slight cracking to front hinge. Light scuffing to text-block edges. Paper cover has moderate edge wear with scuffing to edges and creasing. Small splits to joints. Mild tanning to spine and edges. Mild rubbing to surfaces with curling to corners. Scuffing alone spine joints. Minor brown staining to surfaces.