1967. Twenty-fifth Edition Reprinted. 525 pages. Illustrated dust jacket over green cloth boards with lettering. Contains black and white illustrations. Clean pages and illustrations with light tanning and mild foxing throughout. Minor tanning to free endpapers due to dust jacket flaps. Binding remains firm. Boards have mild edge-wear with slight rubbing to surfaces and bumping to corners. Lettering is bright and clear. Minor wear marks to boards. Clipped jacket. Panels and spine have light edgewear with tears and creases. Moderate tanning to interior flaps, panels and spine. Visible wear marks to spine and panels.