1964. Fourth edition. 341 pages. Blue jacket over blue cloth with gilt titles to spine. Includes photographic plates. Includes various diagrams. Pages and binding are presentable with no major defects. Minor issues present such as inscriptions, 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 edge wear with minor tears and chipping. Mild rubbing and marking. Jacket is in a transparent sleeve.