1968. Twenty First Edition. 1156 pages. No dust jacket. Red cloth covered boards with gilt. Pages remain clear with minimal tanning and foxing. Previous owner's ink stamp to front free end-paper and text block edge. Minor pencil marking to front paste-down. Cracking to hinges, no damage to end papers. Binding remains firm. Boards have mild edge-wear with slight rubbing to surfaces. Mild crushing to spine ends. Gilt lettering is bright and clear. Book has a slight forward lean.