1970. Sixth Edition. 329 pages. Beige dust jacket over blue cloth. Contains black and white in-text illustrations. Contains black and white photographic plates. Pages and plates are lightly tanned and foxed throughout. Occasional thumb-marking present. Cracking to front hinge with exposed binding. Binding is slightly shaky. Boards have mild edge wear with slight rubbing to surfaces. Soft crushing to spine ends. Light tanning to spine and edges.Book is slightly forward leaning. Unclipped jacket has moderate edge wear with chips, tears and creasing. Moderate tanning to spine and edges. Scuffing and light marking overall. Brown staining to edge of front panel.