1971. 4th Edition. 179 pages. Yellow dust jacket over brown cloth. Binding remains firm. Pages have light tanning and foxing throughout. Pencil inscription to front free endpaper. Boards have light shelf-wear with corner bumping. Light tanning to spine and edges. Unclipped jacket has moderate edgewear with chips, tears, and creasing. Light tanning and water staining to spine and edges. Paper worn away to rear panel. Foxing overall.