1951. Fourth Edition. 104 pages. Pictorial dust jacket over red cloth. Contains black and white in-text illustrations. Pages are lightly tanned and foxed throughout, heavier to endpapers. Occasional thumb-marking present. Binding remains firm. Boards have moderate edge wear with bumping to corners and rubbing to surfaces. Soft crushing to spine ends. Mild tanning to spine and edges. Scuffing and light marking overall. Book is slightly bowed and forward leaning. Unclipped jacket has heavy edge wear with some areas of loss, heavy tears, chips and creasing. Dark rubbing and marking to surfaces. Mild tanning to spine and edges.