1966. Fourth Edition. 139 pages. This is an ex-Library book. Red and cream dust jacket over red cloth. Library copy, with expected inserts and inscriptions. Pages remain bright and clear with minimal tanning and foxing. Noticeable creasing to gutter. Binding remains firm. Boards have mild edge-wear with slight rubbing to surfaces. Some bumping to corners. Soft crushing to spine ends. Minor marks to boards. Unclipped jacket has moderate edgewear with chips, tears and creasing. Loss to spine ends and edges. Some tanning to spine. Visible rubbing to surfaces. Scuffing to edges.