1968. First Revised Edition. Unpaginated. This is an ex-Library book. Illustrated dust jacket over black cloth covered boards. Ex-Library copy, with expected inserts, stamps and inscriptions. 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. Book has a slight forward lean. Remnants of jacket protector stuck to boards. Unclipped jacket has moderate edge-wear with chips, tears and creasing.