1971. Sixth Edition. 596 pages. Red and black dust jacket over red cloth with photographic black and white in text images and black and white illustrations throughout. Mild tanning to pages with heavier tanning to pastedowns and endpapers. Tape residue and pen inscriptions to front endpaper and minor tanning to text block edges. Book is shaky. Boards have mild rubbing and light bumping to corners. Soft crushing to spine ends. Unclipped jacket with visible edge wear and rubbing. Splitting to joints and visible tearing to corners, edges and spine ends. Minor foxing to interior.