1968. Fourth Edition. 410 pages. Illustrated dust jacket over blue cloth boards with lettering. Black and white pictorial frontispiece and with plates 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. Panels and spine have moderate edgewear with chips, tears and creases. Minor loss to spine and panel.