Eleventh Edition. 306 pages. No dust jacket. Blue cloth boards with gilt lettering. Gilt lettering. Contains black and white illustrations. Clean pages and illustrations with noticeable tanning and foxing throughout. More pronounced to free endpapers and pastedowns. Pencil markings to front free endpaper. Pencil annotations and marginalia to a few pages. Binding remains firm. Boards have moderate edge-wear with bumping to corners and rubbing to surfaces. Gilt lettering is bright and clear. Minor sunning to spine and edges with crushing to spine ends. Minor splits to spine ends and corners causing cloth to be frayed. Visible wear marks to boards.