1968. No Edition Remarks. 366 pages. No dust jacket. Blue cloth. Black and white graphs throughout. Pages are bright and clear; light tanning to text block edges. Previous owners' inscription in pen to front pastedown and free endpaper. Binding remains firm. Boards have minor corner bumping and edgewear with visible scuffing overall. Spine has minor tanning with soft crushing to ends. Book has a slight forward lean.