1964. Fifth Impression. 551 pages. Pictorial paper covers. Black and white photographic plates and illustrated diagrams. Minor foxing and tanning to pages and plates. More prominent to text block edges, front and rear most pages, with some light tape staining also visible. Pen inscription to first page. Annotations, underlining and marginalia in pencil throughout; text remains unaffected. Binding remains firm. Paper covers have light edge-wear and corner curling with mild creasing and scuffing overall. Spine has noticeable bowing, rolling and creasing.