1957. 6th Revised Edition. 122 pages. No dust jacket. This is an ex-Library book. Red cloth with gilt lettering. Expected library inserts, stamps and inscriptions. Pages and binding are presentable with no major defects. Minor issues present such as mild cracking, inscriptions, inserts, light foxing, tanning and thumb marking. Overall a good condition item. Boards have mild edge-wear with bumping to corners. Light crushing to spine. Gilt lettering remains bright and clear. Book has a slight forward lean.