1950. Fourth Edition; Second Printing. 410 pages. No dust jacket. Blue cloth. Contains black and white illustrations throughout. Pages remain bright and clear with minimal tanning and foxing. Heavier tanning to free endpapers and pastedowns. Pencil inscription to front free endpaper. Visible creasing to gutter. Boards have mild edge-wear with slight rubbing to surfaces. Soft crushing to spine ends. Some tanning to spine and edges. Small marks to boards. Sticker to rear board. Textblock is shaky.