1973. Fourth Revised Edition. 175 pages. Colour photographic dust jacket over green cloth with colour photographic 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. Clipped jacket has light edge wear with minor tears and chipping. Mild rubbing and marking.