BROOKLYN, MI - JULY 4: The partial field of the USAC stock car race (#21 Bobby Unser, #2 A.J. Foyt, Jr., #3 Don White, #1 Roger McCluskey) pass the starter's stand as part of the unusual Twin Bill for stock and open wheel racers on July 4, 1970 at Michigan International Raceway in Brooklyn, Michigan. (Photo by Alvis Upitis/)