1963. Twelfth Edition. 722 pages. Dust jacket over blue cloth. Black and white illustrations throughout. Pages are bright and clear; Light foxing and tanning to text block edges. Binding remains firm. Boards have moderate corner bumping and edge-wear with light bubbling and scuffing overall. Spine has 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. Noticeable stains to front cover.