1965. Second Revised Edition. 420 pages. No dust jacket. Blue cloth with silver lettering. Black and white diagrams throughout with photographic plates to centre of book. Slight cracking to hinges, with exposed netting, pages slightly loose. Pages are lightly tanned throughout with light foxing to endpapers. Diagrams and plates are bright and clear, with some light tanning and foxing to edges. Pencil inscription to front free endpaper. Minor dog-eared corners. Boards have light shelf-wear with corner bumping. Slight crushing to spine ends. Wear marks overall.