1973 Schaefer 500

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

Cars line pit road prior to the start of the third annual USAC Schaefer 500 at Pocono Int’l Raceway.

Mark Donohue (left) talks with crew members on pit road.
The front row for the 1973 USAC championship Indy car race at Pennsylvania’s Pocono Raceway. That’s polesitter Peter Revson closest to the camera, with Al Unser in the middle and Mario Andretti on the outside.

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