1955. Twelfth Edition. 769 pages. Brown dust jacket over blue cloth. Contains black and white illustrations throughout. Pages and binding are presentable with no major defects. Minor issues present such as mild cracking, inscriptions, inserts, light foxing, tanning and thumb marking. Overall a good condition item. Boards have mild shelf wear with light rubbing and corner bumping. Some light marking and sunning. Unclipped jacket has moderate edgewear with chips, tears and creasing. Notable tanning to spine. Visible rubbing to surfaces. Scuffing to edges.