Scalzo, Joe. THE UNBELIEVABLE UNSERS: THE AUTHORIZED BIOGRAPHY OF THE FIRST FAMILY OF SPEED. Chicago: Henry Regnery Company, (1971). Signed and inscribed by Al Unser, Bobby Unser and Al Unser, Jr. Bobby Unser has also inscribed the dedication page. Red cloth lettered in gilt along the spine. The dust jacket has moderate creasing, and a stain to the heel of the spine. Publisher's price of $6.95 to the front flap. Illustrated with black and white photos. Good in a Good dust jacket.