1969. First Published. 156 pages. Illustrated dust jacket over black cloth with gilt lettering. Contains black and white graphs. Pages are mildly tanned throughout. Text is clear. Binding remains firm. Boards have mild edge-wear with bumping to corners. Light crushing to spine ends. Gilt lettering remains bright & clear. Unclipped jacket. Panels have light edge wear with tears and creasing. Severe sunning to spine.