1951. Sixth Edition. 185 pages. No dust jacket. Green cloth covered boards. Pages remain clear with minimal tanning and foxing. Text block edge is moderately foxed. End papers are more notably tanned. Previous owner's inscription to front free end-paper. Slight impact mark to top edge of text block. Binding remains firm. Boards have mild edge-wear with slight rubbing to surfaces. Mild crushing to spine ends. Boards have minor damp and dust stains. Book has a slight forward lean.