1973. Sixteenth Edition. 718 pages. Illustrated dust jacket over red cloth boards with gilt lettering. Contains black and white illustrations throughout. Moderate crinkling to paper at gutter. Pages and illustrations are heavily tanned and foxed with visible markings throughout. Binding remains firm. Boards have mild edge-wear with slight rubbing to surfaces and bumping to corners. Slight crushing to spine ends. Gilt lettering is bright and clear. Unclipped Jacket. Panels and spine have light edgewear with tears and creases. Moderate tanning to interior flaps, panels and spine.