Unser leads Andretti USAC 1968
CLERMONT, IN - JULY 21: Al Unser in a 4-wheel-drive Lola-Ford leads Mario Andretti's Hawk-Ford in the USAC Championship Trail Indianapolis Raceway Park 200, a two heat race, run on July 21, 1968 at Clermont, Indiana. (Photo by Alvis Upitis)