1966. Fifteenth Edition. 288 pages. Pictorial dust jacket over blue cloth boards with lettering. Contains black and white illustrations. Clean pages and illustrations with light tanning. Moderate 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 darkened. Minor sunning to spine and edges with crushing to spine ends. Book has a slight forward lean. Visible wear marks to boards. Unclipped jacket. Panels and spine have light edgewear with tears and creases. Visible wear marks to spine and panels.