1961. Revised and Reprinted. 97 pages. Green dust-jacket over blue cloth. Pages remain bright and clear with minimal tanning and foxing. Unequal tanning to endpaper corresponding with jacket flaps. Heavy mark to page 15. Boards have mild edge-wear with slight rubbing to surfaces. Spine has crushing to both ends. Book has forward lean. Unclipped jacket has light edgewear with tears and creasing. Jacket has moderate tanning.