1968. Second Edition. 534 pages. Illustrated dust jacket over cloth. Pages remain clear with minimal tanning and foxing. Binding remains firm. Boards have moderate edge-wear with bumping to corners and 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. Moderate tanning to spine.