1971. Sixty-sixth Edition. 232 pages. Pictorial paper covers. Black and white and colour photographic plates. Light tanning to pages, plates and reverse of covers. More prominent to text block edges. Light cracking and staining to gutters but binding remains firm. Occasional annotations, underlining and marginalia in pen; text remains unaffected. Paper covers have light edge-wear and corner curling with mild tanning and scuffing overall. Spine has minor rolling and creasing.