1966. First edition thus. 144 pages. Pictorial dust jacket over blue cloth. Black and white photographs. Black and white diagrams by John Polgreen. Pages with some foxing and tanning, particularly to endpapers and textblock edges. Binding remains firm. Boards have mild shelf wear with light rubbing and corner bumping. Some mild marking and tanning. Unclipped jacket has heavy edge wear with tears, chipping and creasing. Some rubbing and marking to surfaces. Small piece of tape to spine.