1957. Third Edition Revised Enlarged. 771 pages. No dust jacket. Blue cloth with gilt lettering. Pages remain bright and clear with minimal tanning and foxing. Minor dog-eared corners to some pages. Binding remains firm. Pen inscription to front free endpaper. Boards have moderate edge-wear with bumping to corners and rubbing to surfaces. Gilt lettering is dulled. Some fraying to cloth at spine ends.