1968. Fourth Edition. 158 pages. Dust jacket over paperback book with white cover. 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. Paper cover has mild edge-wear with light rubbing and creasing. Some light marking and tanning. Unclipped jacket has light edgewear with tears and creasing. Moderate tanning to spine. Mild rubbing and marking all over.