First Edition. 220 pages. Pictorial dust jacket over pictorial cloth covered boards. Black and white diagrams. Pages remain bright and clean with minimal tanning and foxing. Binding remains firm. A previous owner's name to front free endpaper. Boards have moderate shelf wear with mild bumping and fraying to corners and crushing and fraying to spine ends. All surfaces tanned and sunned, particularly spine. Boards are slightly bowed. Book has slight forward lean. Clipped jacket has light edge wear with minor tears, chipping and creasing. Some tanning and foxing to all surfaces, particularly to spine.