1967. Fifth Edition. 422 pages. Beige dust jacket over black cloth. Contains black and white illustrations, tables and pictures. Pages are slightly tanned with mild foxing throughout. Heavier to endpapers and pastedowns. Previous owner's inscription to front free endpaper. Slight crinkling to paper at gutters, however binding remains firm. Brown marks throughout, text still readable. Occasional thumb-marking. Boards have slight edge wear with corner bumping. Minimal tanning to spine and edges with some crushing to spine ends. Gilt lettering is bright and clear. Unclipped jacket, repaired with tape. Panels have heavy edge wear with chips, tears and creasing. Small area of loss to spine tails, edges and joints.