1969. Fourth Edition. 456 pages. No dust jacket. Blue cloth with gilt lettering. Facsimile. Pages are bright and clear with light foxing and tanning to text block edges and free endpapers; slight staining to hinges. Binding remains firm. Book is visibly bowed and forward leaning with visible scuffing overall. Spine has light tanning with soft crushing to ends. Lettering remains bright and clear.