1963. Fourth Revised Edition. 261 pages. No dust jacket. Red cloth covered boards with gilt. Pages remain clear with minimal tanning and foxing. Front free end paper excised. Half title ripped, with loss. Cracking to hinges, no damage to end papers. Some occasional mild cracking to gutters throughout, binding remains reasonably firm. Boards have moderate edge-wear with bumping to corners and rubbing to surfaces. Mild crushing to spine ends, with fraying cloth and small splits. Gilt lettering is bright and clear. Cloth has minor damp and dust stains. Book has a slight forward lean.