1950. Fourth Edition. 224 pages. No dust jacket. Cream cloth covered boards. Pages remain clear with minimal tanning and foxing. Previous owner's inscription to front free end-paper and redacted address label to front paste down. Binding remains firm. Boards have moderate edge-wear with bumping to corners and rubbing to surfaces. Moderate crushing to spine ends, with splitting, fraying and loss to the head, tail. Sunning to both boards.