1974. Fourth Edition. 421 pages. Illustrated dust jacket over blue cloth boards. Gilt lettering. Contains black and white illustrations. Clean pages and illustrations with light tanning and mild foxing throughout. Pencil markings to front pastedown. Binding remains firm. Boards have mild edge-wear with slight rubbing to surfaces and bumping to corners. Gilt lettering is bright and clear. Unclipped jacket. Panels and spine have light edgewear with tears and creases. Moderate tanning and wear marks to flaps, panels and spine.