Sixth Edition. 143 pages. Blue paperback. Volume I. Contains black and white illustrations throughout. Pages are moderately tanned and foxed throughout. Previous owner's inscription to title page. Thumb-marking present. Rusty staple binding. Pulling to covers. Binding remains firm. Paper covers have moderate edge-wear with curling to corners and rubbing to surfaces. Visible tanning to spine and edges. Red marks to covers. Tearing to rear cover. Marks to rear cover.