1960. First Published. 227 pages. Blue & pink jacket over blue cloth with gilt lettering. Pen inscription & traces of tape to front free endpaper. Contains black & white diagrams. Pages are mildly tanned & foxed throughout. Heavier to endpapers & paste downs. Text is clear. Binding remains firm. Boards have mild edge-wear with bumping to corners. Slight crushing to spine ends. Unclipped jacket. Panels have moderate edge wear with chips, tears, and creasing.