1950. Fifth and Revised Edition. 484 pages. No dust jacket. Red cloth covered boards. Pages remain clear with minimal tanning and foxing. Minor pencil marking to front free end-paper. 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. Sunning to spine. Book has a slight forward lean. Cloth has minor damp and dust stains.