1950. Revised Edition. 127 pages. Pictorial dust jacket over green cloth. Supplemetary chapter by G F Hudson. 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 moderate shelf wear, with rubbing and marking. Light bumping to corners and crushing to spine ends. Book has noticeable forward lean, with light spots of tanning to spine. Unclipped jacket has light edge wear with minor tears and chipping. Moderate tanning and creasing, with rubbing and marking.