1967. Twenty-fifth Edition. 1804 pages. No dust jacket. Blue cloth boards with gilt lettering. Slight crinkling to paper at gutter. Clean pages with light tanning and foxing to text block edges. Binding is firm throughout with minor thumb-marking. Textblock edges dyed red. Boards have mild edge-wear with slight rubbing to surfaces and bumping to corners. Slight crushing to spine ends. Gilt lettering is bright and clear. Moderate sunning to spine and edges. Minor wear marks to boards.