1967. Sixth Impression. 130 pages. Illustrated dust jacket over blue cloth covered boards with gilt. Pages remain clear with minimal tanning and foxing. Text block edge is moderately foxed. Minor pencil marking to front free end-paper. Binding remains firm. Boards have mild edge-wear with slight rubbing to surfaces. Gilt lettering is bright and clear. Book has a slight forward lean. Unclipped jacket has light edge-wear with tears and creasing. Moderate tanning to spine.