1950. Fourth Edition. 480 pages. Blue dust jacket over brown cloth. Clean pages with noticeable tanning and foxing throughout. Tightly bound with faint thumb-marking throughout. Previous owner's inscription to front pastedown. Boards have light edge wear with minor corner bumping. Mild crushing to spine, with occasional markings overall. Clipped jacket has light edgewear with tears and creasing. Mild tanning to spine and panel edges. Mild foxing to surfaces.