1920. No Edition Remarks. 77 pages. No dust jacket. Red cloth. With fold-out illustrated diagrams. Pages and plates are lightly tanned and foxed throughout. Light tears and creasing to fold-out diagrams. Previous owner's inscription to front free endpaper. Binding remains firm. Boards have mild edge wear with slight rubbing to surfaces. Crushing to spine ends with small splits and fraying to cloth. Mild sunning to spine and edges. Water staining to surfaces. Dark rubbing to surfaces, heavier to edges.