Certain Sound: Thirty Years of Motor Racing (John Wyer/GT40/Porsche 917)This is a second hand copy of Certain Sound: Thirty Years of Motor Racing by John Wyer. Description: It is a hardcover and 255 pages. Published 1981. Comes with a dust jacket. Dust jacket is covered in a non adhesive PVC cover to keep it safe. This can easily be removed. ISBN: 2 88001 111 6 Condition: used (fine). Small tear to back of dust jacket (top middle) visible in product image. Possible UV damage but hard to tell if part of design. From the