1945. Seventeenth edition. 527 pages. Pictorial dust jacket over red cloth. Black and white photographs and diagrams. Pages remain bright and clean with minimal tanning and foxing. Binding slightly loose. Minor pencil inscriptions to front free endpaper. Boards have moderate shelf wear with some rubbing and corner bumping. Some moderate marking and tanning. A heavy crease in front board. Unclipped jacket has light edge wear with minor tears, chipping and creasing. All surfaces heavily tanned, particularly spine.