1972. Revised Edition. 159 pages. This is an ex-Library book. Dust jacket covered in removable plastic wrapper over blue cloth. Library copy, with expected inserts and inscriptions. Clean pages with heavy tanning throughout. Tightly bound with faint thumb-marking throughout. Missing front free endpaper. Pencil inscription to front endpaper. Boards are assumed in good condition as are covered with taped on jacket. Book has forward lean. Unclipped jacket has light edgewear with tears and creasing. Light rubbing and marking all over.