1961. No Edition Stated. 167 pages. This is an ex-Library book. White jacket over blue cloth. Contains black and white diagrams throughout, with a few photographic plates. Expected library inserts, stamps and inscriptions. Pages and plates are lightly tanned, but text and images are clear. Binding is firm. Previous owner's inscription to front free endpaper. Boards and spine have minimal shelf-wear, with minor corner bumping and crushing to ends. Clipped jacket. Moderate tanning to interior. Visible black marks to exterior. Minor edgewear with light creasing and minimal chipping to spine ends.