1961. Twentieth Edition. 391 pages. Beige dust jacket over red cloth. Contains 2 removable booklets with extra content. Pages are mildly tanned, and text remains bright and clear. Binding is firm. A few pencil inscriptions and annotations throughout. Some brown stains to endpapers. Boards have minimal edgewear. Spine ends are mildly crushed. Book has a slight forward lean. Unclipped jacket. Faint black marks overall. Minimal edgewear, with slight chipping to spine ends. Some brown stains to left flap.