1949. Second Edition. 442 pages. No dust jacket. Dark blue cloth with fold out diagrams and black and white illustrations throughout. Moderate foxing and tanning to pages with heavier tanning to pastedowns and endpapers. Pen inscriptions to front pastedown and endpaper with visible foxing and tanning to text block edges. Boards have visible rubbing and noticeable bumping to corners. Fair crushing to spine ends.