1963. Sixth Edition Revised and Reset. 308 pages. Illustrated dust jacket over blue cloth with silver lettering. Black and white illustrations throughout. Light tanning to pages and text block edges. Binding remains firm. Boards have minor corner bumping and edgewear with mild sunning and scuffing overall. Spine has subtle tanning with soft crushing to ends. Lettering remains bright and clear. Book has a slight forward lean. Unclipped dust jacket with minor rubbing, chipping and tearing to edges. Moderate tanning and scuffing overall.