1966. Thirteenth Edition. 344 pages. Illustrated dust jacket over red cloth covered boards with gilt. Pages remain clear with minimal tanning and foxing. Binding remains firm. Boards have mild edge-wear with slight rubbing to surfaces. Mild crushing to spine ends. Gilt lettering is bright and clear. Board corners are bumped. Boards have minor damp and dust stains. Unclipped jacket has moderate edge-wear with chips, tears and creasing.