Al Unser Mark Donohue Bobby Unser

Al Unser Mark Donohue Bobby Unser

Al Unser (left), Mark Donohue (center) and Bobby Unser chat on pit road before the 1973 Schaefer 500.

Al Unser (left), Mark Donohue (center) and Bobby Unser chat on pit road before the 1973 Schaefer 500.

Mario Andretti signs autographs for fans at Pocono Int'l Raceway.

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