1963. Fourth Edition (Revised). 161 pages. Plain dust jacket over red cloth covered boards with gilt. Pages remain clear with minimal tanning and foxing. Minor pencil marking to front free end-paper. Binding remains firm. 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. Unclipped jacket has moderate edge-wear with chips, tears and creasing. Moderate tanning to spine.