1967. Fifth edition. 507 pages. Pictorial dust jacket over red cloth. Black and white diagrams throughout. Pages remain bright and clean with minimal tanning and foxing. Binding remains firm. A previous owner's name to front free endpaper. Some page corners folded. Boards have moderate shelf wear with mild bumping and fraying to corners and crushing and fraying to spine ends. All surfaces tanned and sunned. Unclipped jacket has heavy edge wear with large tears, chipping and creasing.