1950. First Edition. 253 pages. Green jacket over green cloth. Contains black and white diagrams throughout. Pages remain bright and clear. Binding is firm. Boards and spine have minimal shelf-wear, with mild corner bumping and crushing to ends. Small split to head of spine. A few noticeable marks to boards. Unclipped jacket. Panels have light edgewear, with small tears, chips and creases, heavier to spine ends. Noticeable creasing to front panel.