1959. Sixth Edition. 176 pages. Illustrated dust jacket over blue cloth. Black and white illustrations throughout. Pages are bright and clear with light tanning to text block edges, pastedowns and free endpapers. Light cracking to gutters but binding remains firm. Boards have minor corner bumping and edgewear with mild tanning and scuffing overall. Spine has light tanning with soft crushing to ends. Book has a slight forward lean. Unclipped dust jacket with minor rubbing, chipping and tearing to edges. Moderate tanning and scuffing overall.