1962. Fourth Edition. 432 pages. Dust jacket over blue cloth. Pages are bright and clear with no visible markings. Binding throughout remains firm. Boards have light edge wear with minor corner bumping. Mild crushing to spine, with occasional markings overall. Books has a backward lean. Boards are mildly warped. Clipped jacket has light edgewear with tears and creasing. Heavy tanning to spine. Mild rubbing and marking all over.