1950. Fourth Edition. 104 pages. Dust jacket over green cloth. Book is in better condition than most examples of this age. Neat, clean, well bound pages with very minimal foxing, tanning and thumbing. Small inscriptions and neat labels may be present. Boards have mild shelf wear with light rubbing and corner bumping. Some light marking and sunning. Unclipped jacket has light edgewear with tears and creasing. Heavy tanning to spine. Notable rubbing and marking all over.