1967. Fifteenth Edition. Unpaginated. No dust jacket. Two books bound joined together, each paginated separately. Black cloth boards with gilt lettering. Clean pages with light tanning to text block edges. Binding is firm throughout with minor thumb-marking. Ownership plate stuck to front free endpaper. Boards have moderate edge-wear with bumping to corners and rubbing to surfaces. Slight crushing to spine ends. Gilt lettering is darkened. Visible wear marks to boards.