1958. Revised edition. 475 pages. Pictorial dust jacket over brown cloth. Black and white diagrams throughout. Pages remain bright and clean with minimal tanning and foxing. Binding remains firm. Boards have moderate shelf wear with mild bumping and fraying to corners and crushing and fraying to spine ends. All surfaces tanned and sunned, particularly spine. Unclipped jacket has heavy edge wear with tears, chipping and creasing. Spine noticeably sunned.