1968. Fourth Edition. 298 pages. Paperback book with brown cover. Contains black and white photographic plates. Clean pages with light tanning and foxing throughout. Tightly bound with faint thumb-marking throughout. Mild droplet staining to text block edges. Paper cover has mild edge wear with mild corner curling. Notable creasing to covers and spine. Heavy tanning to spine. Mild scratching and marking to covers. Ring mark to rear cover.