1957. Fourth Edition. 270 pages. Yellow dust jacket over blue 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. Book is slightly forward leaning. Light tanning to spine and edges. Unclipped jacket has moderate edge wear with chips, tears and creasing. Scuffing and light marking overall. Dark rubbing to all surfaces.