1975. No edition remarks. 288 pages. Pictorial dust jacket over blue cloth. Black and white diagrams. Pages with some foxing and tanning, particularly to endpapers and textblock edges. Binding remains firm. Pen inscription to top of textblock. Boards have light shelf wear with minor corner bumping and crushing to spine ends. Unclipped jacket has light edge wear with minor chipping and creasing. Some tanning and foxing to all surfaces, particularly to spine.