1966. Seventh Edition. 389 pages. Blue dust jacket over blue cloth. Pages remain bright and clear with minimal tanning and foxing. Thumb-marking present. Light creasing to gutter. Binding remains firm. Boards have mild edge-wear with slight rubbing to surfaces. Noticeable white marks to all. Unclipped jacket has moderate edgewear with chips, tears and creasing. Noticeable tanning to spine. Visible rubbing to surfaces. Scuffing to edges.