1970. Third Edition. 326 pages. No dust jacket. Blue cloth. Contains black and white photographs and diagrams throughout. Pages remain bright and clear, with mild tanning to edges. A few small visible marks throughout, including to edges; text is unaffected. Binding is firm. Previous owner's inscription to front free endpaper. Boards and spine have minimal shelf-wear, with minor corner bumping and crushing to ends. Noticeable mark to rear board.