1968. Fourth Edition. 208 pages. Illustrative jacket over blue cloth. Contains black and white illustrations throughout. Volume I. Pages remain bright and clear with minimal tanning and foxing. Previous owner's inscription to front free endpaper. Noticeable creasing to gutter. Cracking to gutters, with exposed netting. Pages remain intact. Boards have mild edge-wear with slight rubbing to surfaces. Light crushing to spine ends. Minor marks to boards. Unclipped jacket has moderate edgewear with chips, tears and creasing. Some sunning to spine. Visible rubbing to surfaces. Scuffing to edges.