1966. Fourth Revised Edition. 378 pages. Pictorial dust jacket over red cloth with gilt lettering. Black and white illustrations throughout. Pages are bright and clear with light foxing and tanning to text block edges, pastedowns and free endpapers. Light cracking and creasing to gutters but binding remains firm. Boards have minor corner bumping and edgewear with mild tanning and scuffing overall. Spine has minor 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.