Sunday 10th June 1979
Bobby Unser drove the “Norton Spirit” Penske-Cosworth to victory in both races of the Trenton Twin Indy at Trenton Speedway in Trenton, New Jersey, US.




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Bobby Unser drove the “Norton Spirit” Penske-Cosworth to victory in both races of the Trenton Twin Indy at Trenton Speedway in Trenton, New Jersey, US.
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