1959. Second Edition. 56 pages. Pictorial jacket over brown cloth. Contains black and white diagrams throughout. Pages are mildly tanned, but text remains clear. Mild marking to some pages throughout; text is not obscured. Binding is firm. Previous owner's inscription to front pastedown. Boards have light shelf-wear, with minor corner bumping and minimal scuffing to edges. Spine and edges are moderately sunned, with noticeable crushing and slight splitting to ends. Boards are slightly bowed. Unclipped jacket. Moderate tanning to all surfaces, heaviest to spine and edges. Heavy edgewear, with visible rips and chipping, and some areas of loss. Paper remnants to front panel.