1965. Third Edition. 528 pages. No dust jacket. Grey cloth with white lettering to front & spine. Pen inscription to front free endpaper. Contains black & white diagrams. Pages remain bright with minimal tanning. Heavier to endpapers & paste downs. Text is clear. Binding is slightly shaky , however pages remain attached. Book has a slight forward lean. Boards have mild edge-wear with bumping to corners. Slight crushing to spine ends. White lettering is bright and clear to front board & Spine.