1957. Reprint. 144 pages. Blue and yellow jacket over blue cloth. Contains black and white illustrated frontispiece, with black and white photographic plates throughout. Also contains diagrams. Pages and plates remain bright and clear. Mild foxing to endpapers. Binding is firm. Boards and spine have minimal shelf-wear, with mild corner bumping and crushing to ends. Spine is slightly sunned. Small visible marks overeall. Boards are noticeably bowed. Unclipped jacket. Light tanning and foxing to all surfaces. Panels have light edgewear, with small tears, chips and creases, heavier to spine ends.