1962. Seventh Edition. 142 pages. Dust jacket over paperback book. Black and white illustrations throughout. Clean pages with mild foxing throughout. Tightly bound with faint thumb-marking throughout. Paper cover has mild edge wear with mild corner curling. Mild foxing. Mild scratching and marking to covers. Covers are mildly warped. Unclipped jacket has light edgewear with tears and creasing. Light rubbing and marking all over.