1969. No edition remarks. 130 pages. Pictorial dust jacket over green cloth. Black and white diagrams. Pages remain bright and clean with minimal tanning and foxing. Binding remains firm. Minor pen inscriptions to front free endpaper. Boards have light shelf wear with minor corner bumping and crushing to spine ends. Unclipped jacket has light edge wear with minor tears, chipping and creasing. Some tanning and foxing to all surfaces, particularly to spine. Some rubbing and marking.