1951. Third Edition Revised. 476 pages. Grey jacket over blue cloth. 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. Clipped jacket has moderate edgewear with chips, tears and creasing. Visible tanning to spine. Some rubbing to surfaces.