1973. Second impression. 119 pages. Signed by the author. Pictorial dust jacket over green cloth. Black and white photographs and diagrams. Signed with dedication from the author on front free endpaper. Pages remain bright and clean with minimal tanning and foxing. Binding remains firm. Boards have light shelf wear with minor corner bumping and crushing to spine ends. Clipped jacket has light edge wear with some tears, chipping and creasing. Some tape repairs.