1953. Third Edition. 165 pages. Green dust jacket over green cloth. With some fold-out charts. Pages remain bright and clear with minimal tanning and foxing. Fold-out charts are in good condition. Occasional thumb-marking present. Binding remains firm. Boards have mild edge wear with slight rubbing to surfaces. Soft crushing to spine ends. Unclipped jacket has moderate edge wear with chips, tears and creasing. Moderate tanning to spine and edges.