1946. Fourth Edition. 590 pages. No dust jacket. Blue cloth boards with gilt lettering. Contains black and white illustrations throughout. Slight crinkling to paper at gutter. Clean pages and illustrations with noticeable tanning throughout. Tightly bound with faint thumb marking throughout. Heavier tanning to free endpapers. Pencil markings to front free endpaper. Pencil annotations and marginalia to pages throughout. Boards have moderate edge-wear with bumping to corners and rubbing to surfaces. Moderate crushing and fraying to spine ends and corners. Gilt lettering is darkened. Moderate sunning to spine and edges. Visible wear marks to boards.