1956. Seventh Revised Edition. 144 pages. Pictorial dust jacket over blue cloth. Contains black and white photographic plates. Pages and plates are lightly tanned and foxed throughout. Scuffing and small splits to hinges. Minor pencil inscription to front free endpaper. Binding is slightly shaky. Boards have mild edge wear with slight rubbing to surfaces. Soft crushing to spine ends. Light tanning to spine and edges. Moderate speckled bleached marking to all surfaces. Unclipped jacket has moderate edge wear with chips, tears and creasing. Rubbed marking to all surfaces. Light sunning to spine and edges.