1968. 4th edition. 531 pages. White jacket over black cloth with gilt lettering to spine within a red headband. Contains black & white illustrations and plates. Pen inscription to front free endpaper. Pages are mildly tanned throughout. Text is clear. Thumb-marking present. Binding remains firm. Boards have mild edge-wear with bumping to corners. Light crushing to spine ends. Gilt lettering remains bright & clear. Unclipped jacket. Panels have heavy edge wear with some areas of loss, tears, chips, and creasing.