F5000 Donnybrooke 1972
BRAINERD, MN - JULY 30: Sam Posey in a Surtees TS11 leads John Cannon and Graham McRae during Heat One of the Minnesota Grand Prix of the L&M Continental Series (F5000) held in two heats on July 30, 1972 at Donnybrooke Raceway in Brainerd, Minnesota. (Photo by Alvis Upitis)