1956. Fourth Edition. 436 pages. Dust jacket over blue cloth. Bright and clean pages with light tanning throughout. Binding is firm throughout with minor thumb-marking. Pencil inscription to front endpaper. Boards have light edge wear with minor corner bumping. Mild crushing to spine, with occasional markings overall. Mild tanning to spine and board edges. Book has forward lean. Unclipped jacket has heavy edgewear with some areas of loss, heavy tears, chips, and creasing. Heavy tear to rear joint. Heavy tanning to spine and edges. Notable rubbing and marking all over.