1968. Revised Edition. 316 pages. Illustrated dust jacket over blue cloth covered boards. Pages remain clear with minimal tanning and foxing. 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. Cloth has minor damp and dust stains. Book has a slight forward lean. Unclipped jacket has light edge-wear with tears and creasing.