1961. No Edition Remarks. 641 pages. No dust jacket. Blue embossed cloth. Black and white photographic plates and graphs throughout. Pages and plates are bright and clear; light tanning to text block edges. Front hinge is visibly cracked with netting exposed but remains attached. Binding otherwise remains firm. Boards have minor corner bumping and edgewear with visible marking and scuffing overall. Spine has moderate tanning with soft crushing to ends.