1960. Seventh Edition. 582 pages. Green dust jacket over black cloth. Contains black and white in-text illustrations. Pages remain bright and clear with minimal tanning and foxing. Minor pencil inscription to rear pastedown. Binding remains firm. Boards have mild edge wear with slight rubbing to surfaces. Soft crushing to spine ends. White marking to bottom edge of spine. Unclipped jacket has heavy edge wear with some areas of loss, heavy tears, chips and creasing. Scuffing to panels. Light tanning to spine and edges.