1967. Thirty-Third Edition. 1551 pages. No dust jacket. Decorated orange cloth. Contains black and white in-text illustrations. Pages are moderately tanned and foxed throughout. Heavy cracking to front hinge with exposed binding, causing board to be loose. Some light creasing to pages. Binding is slightly shaky. Text-block is loose from binding. Boards have moderate edge wear with bumping to corners and rubbing to surfaces. Crushing to spine ends with small splits and fraying to cloth. Moderate tanning to spine and edges. Scuffing and dark marking overall. Some black marking to front board, with area of white soiled marking.