1956. Fourth Edition, Revised. 574 pages. No dust jacket. Green cloth. Pages remain bright and clear, with mild tanning and noticeable foxing to edges and endpapers. Binding is firm. Previous owner's inscription to front free endpaper. Boards have moderate shelf-wear, with noticeable corner bumping and some scuffing to edges. Spine is slightly tanned, with mild crushing to ends. Visible marks overall.