1951. Eleventh Edition. 126 pages. Dust jacket over brown cloth. Black and white illustrations throughout. Clean pages with mild tanning and foxing throughout. Tightly bound with faint thumb-marking throughout. Previous owner's inscription to front endpaper. Boards have light shelf-wear with corner bumping. Mild sunning to spine and board edges. Mild crushing to spine ends. Boards are mildly warped. Moderate water stains to rear board. Clipped jacket has moderate edgewear with chips, tears, and creasing. Heavy foxing. Heavy tanning to spine. Heavy water staining to rear panel.