1951. Eighteenth Edition. 443 pages. Blue dust jacket over blue cloth. Pages remain bright and clear with minimal tanning and foxing. Thumb-marking present. Noticeable creasing to gutter. Boards have mild edge-wear with slight rubbing to surfaces. Soft crushing to spine ends. Some tanning to spine and edges. Minor marks to boards. Textblock is shaky. Unclipped jacket has heavy edgewear with some areas of loss, heavy tears, chips and, creasing. Noticeable tanning to spine. Visible rubbing to surfaces. Scuffing to edges. Marks overall.