1963. Sixth Edition; Revised. 146 pages. Dust jacket over blue cloth. Pages are bright and clear with no visible markings. Binding throughout remains firm. Pencil inscription to front endpaper. Boards have light shelf-wear with corner bumping. Mild crushing to spine ends. Book has forward lean. Unclipped jacket has light edgewear with tears and creasing. Mild tanning to spine. Light rubbing and marking all over.