1961. Sixth Printing. 800 pages. No dust jacket. Blue cloth boards with black and white lettering to spine and front. Black and white diagrams throughout. Pages and binding are presentable with no major defects. Minor issues present such as mild cracking to hinges, mild crinkling, inscriptions and mild tanning. Boards have mild edge wear with light rubbing and crushing. Some light marking and tanning causing discolouration. Lettering is darkened. There is bumping to corners. Book has a slight forward lean.