1968. Ninth Edition. 491 pages. Blue dust 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. Unclipped jacket has light edgewear with tears and creasing. Loss to spine ends. Visible tanning to spine. Light rubbing to surfaces.