1966. Fourth Edition. 192 pages. Pictorial dust jacket over blue cloth. Pages remain bright and clear with minimal tanning and foxing. Pencil inscription to front free endpaper. Visible creasing to gutter. Binding remains firm. Boards have mild edge-wear with slight rubbing to surfaces. Light crushing to spine ends. Some tanning to spine and edges. Minor marks to boards. Unclipped jacket has moderate edgewear with chips, tears and creasing. Some rubbing to surfaces. Scuffing to edges.