1961. Seventh Edition. 1469 pages. No dust jacket. Blue illustrated cloth boards with gilt lettering. Contains black and white illustrations. Clean pages and illustrations with light tanning and mild foxing throughout. More pronounced to free endpapers and pastedowns. Binding remains firm. Boards have mild edge-wear with slight rubbing to surfaces and bumping to corners. Gilt lettering is bright and clear. Moderate tanning to spine and edges with crushing to spine ends. Visible wear marks to boards.