1960. Sixth Edition. 136 pages. No dust jacket. Grey paper covered boards. Contains black and white illustrations throughout. Pages remain bright and clear with minimal tanning and foxing. Clipping to front free endpaper. Light creasing to gutter. Boards have moderate edge-wear with bumping to corners and rubbing to surfaces. Soft crushing to spine ends. Visible tanning to spine and edges. Marks overall. Scuffing to edges. Textblock is shaky.