1970. Metric Edition. 129 pages. No dust jacket. Blue cloth boards with lettering. Clean pages with light tanning and mild foxing throughout. More pronounced to free endpapers and pastedowns. Pencil and pen markings to front pastedown and free endpaper. Binding remains firm. Boards have mild edge-wear with slight rubbing to surfaces and bumping to corners. Lettering is bright and clear. Boards are laminated. Visible wear marks to boards.