1957. Thirtieth Edition. 328 pages. Illustrated dust jacket over red cloth covered boards with gilt. Pages remain clear with minimal tanning and foxing. Departmental stamp to front free end-paper. Some occasional mild cracking to gutters throughout, binding remains reasonably firm. Boards have mild edge-wear with slight rubbing to surfaces. Mild crushing to spine ends. Book has a slight forward lean. Sunning to spine. Unclipped jacket has light edge-wear with tears and creasing. Rear flap almost detached.