The USAC schedule doesnt show Anderson Speedway races , infact they have races going on the same day at O'Reilly Raceway Park

July 25-26 - "Anderson 400" - Anderson Speedway - Anderson, IN -
July 26 - O’Reilly Raceway Park - Indianapolis, IN - USAC National

September 13 - Anderson Speedway - Anderson, IN - USAC
September 13 - O’Reilly Raceway Park - Indianapolis, IN - USAC National


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