1939. No edition remarks. 134 pages. No dust jacket. Blue cloth. Contains black and white photographic plates and diagrams throughout. Pages and plates are lightly tanned and foxed throughout. Previous owner's inscription to front free endpaper. Occasional thumb-marking present. Minor cracking to gutters. Binding remains firm. Boards have mild edge wear with bumping to corners and rubbing to surfaces. Light scuffing and white marks overall. Notable sunning to spine and edges. Book is slightly bowed and forward leaning.