1955. 4th Edition, Revised & Enlarged. 350 pages. Pictorial dust jacket over blue cloth. Black and white illustrations throughout. Severe cracking to front hinges causing front board and spine to be loose. Pages and illustrations have light tanning and foxing throughout. Previous owner's inscription and stamp to front free endpaper. Boards have light shelf-wear with corner bumping. Light tanning to spine and edges with crushing to spine ends. Unclipped jacket has heavy edgewear with areas of loss, heavy tears, chips, and creasing. Tape marking to spine. Wear marks and light foxing overall.