1946. Second Edition Reprint. 109 pages. Dust jacket over blue cloth with black lettering. Black and white diagrams and photographic plates throughout. Binding remains firm. Pages have light tanning and foxing throughout, heavier foxing to pastedowns and endpapers. Diagrams and plates are bright and clear, with some light tanning and foxing to edges. Boards have light shelf-wear with corner bumping. Slight crushing to spine ends. Dent to top edge of rear board. Staining to front board. Book has slight forward lean. Unclipped jacket has moderate edgewear with chips, tears, and creasing. Heavy tanning overall, severe to spine with red stain. Pen inscription to rear panel. Light foxing and wear marks overall. Sticker to front panel.