1964. Fourth Edition. 59 pages. This is an ex-Library book. Illustrated dust jacket over blue paper covered boards with gilt. Ex-Library copy, with expected inserts, stamps and inscriptions. Pages remain clear with minimal tanning and foxing. Binding remains firm. Front free end paper excised. Boards have mild edge-wear with slight rubbing to surfaces. Mild crushing to spine ends. Book has a slight forward lean. Unclipped jacket has light edge-wear with tears and creasing.