1977. No Edition Remarks. 76 pages. Illustrated dust jacket over blue cloth boards with lettering. Contains black and white diagrams. Bright and clean pages and diagrams with light tanning to text block edges. Binding is firm throughout with minor thumb-marking. Pencil markings to front free endpaper. Boards have mild edge-wear with slight rubbing to surfaces and bumping to corners. Gilt lettering is bright and clear. 3 puncture marks to front board. Unclipped jacket. Panels and spine have light edgewear with tears and creases.