1951. Fourth Edition. 544 pages. Pictorial dust jacket over red cloth. Pages are lightly tanned and foxed throughout. Occasional thumb-marking present. Binding remains firm. Boards have mild edge wear with slight rubbing to surfaces. Soft crushing to spine ends. Unclipped jacket has moderate edge wear with chips, tears and creasing. Light tanning to spine and edges. Rubbed marking to panels. Scuffing to spine.