Fourth edition. 256 pages. No dust jacket. Pictorial cloth covered boards. Black and white photographs and diagrams. Pages are heavily tanned and foxed throughout. Some cracking to gutters with exposed netting. Binding loose. A previous owner's name stamp to front free endpaper. Boards have heavy shelf wear with bumping and fraying to corners and crushing and fraying to spine ends. All surfaces heavily tanned, particularly spine. Some additional heavy rubbing and staining.