1961. Ninth Printing. 397 pages. This is an ex-Library book. Orange cloth with blue lettering. Contains black and white diagrams throughout. Expected library inserts, stamps and inscriptions. Pages are mildly tanned, but text remains clear. Binding is firm. Tape remnants to pastedowns. Boards have light shelf-wear, with minor corner bumping and minimal scuffing to edges. Spine ends are slightly crushed. Many visible marks overall.