1961. First Edition. 105 pages. Paperback book with beige paper covers. Contains black and white photographic plates and diagrams throughout. Pages are lightly tanned, with mild foxing to edges, but text remains clear. Binding is firm. Paper covers have minimal edgewear, with mild curling to corners. Mild foxing overall, with brown mark to front cover. Visible grey marks to rear cover. Spine is moderately creased and scuffed to ends. Small tear to front cover. Forward lean.