1968. Fourth Edition. 558 pages. Illustrated dust jacket over grey cloth boards. Gilt lettering. Contains black and white and colour illustrations and plates. Ex-libris label. Clean pages, illustrations and plates with light tanning and mild foxing throughout. Binding remains firm. Boards have mild edge-wear with slight rubbing to surfaces and bumping to corners. Gilt lettering is bright and clear. Clipped jacket. Panels and spine have light edgewear with tears and creases. Moderate tanning and wear marks to flaps, panels and spine.