1950. Thirteenth edition. 591 pages. Orange jacket over red cloth. Enlarged and rewritten by Leo T. Little. 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 shelf wear with light rubbing and corner bumping. Some light marking and tanning. Unclipped jacket has light edge-wear with minor tears and chipping. Mild rubbing and marking. Light tanning to spine and edges.