1967. Fourth Edition. 535 pages. No dust jacket. Green cloth. Pages remain clear with minimal tanning and foxing, mild to end-papers and text-block edges. Minor pencil marking to front free end-paper. Cracking to hinges, no damage to end papers. Boards have mild edge-wear with slight rubbing to surfaces. Mild crushing to spine ends. Book has a slight forward lean. Gilt lettering is bright and clear.