1968. Fifth Impression. 326 pages. Black dust jacket over grey boards with gilt lettering to spine. Black and white graphs, charts and illustrations throughout. Pages and binding are presentable with no major defects. Minor issues present such as inscriptions, mild crinkling and light tanning. Boards have mild edge wear with light rubbing and crushing. Some light marking and tanning. There is bumping to corners. Unclipped jacket has light edge wear with minor tears and chipping. Mild rubbing and marking. Tanning to spine and edges.