1966. Sixth Edition. 808 pages. No dust jacket. Beige paper-covered boards with brown quarter bound cloth. Pages are fairly bright and clear with light tanning to free endpapers and text block edges. Minor dog-eared corners, with a few small nicks and rub marks along text block edge. Moderate cracking to hinges, with exposed netting. Binding is slightly loose. Boards have moderate shelf-wear with notable bumping to corners and rubbing to surfaces. Light tanning to edges, with a prominent backward lean. Notable splitting to front board edge.