CLERMONT, IN - JULY 26: Ronnie Bucknum (#19) about to be lapped by Al Unser (#2) and Mark Donohue (#68) in the USAC INDY 150 Champ Car Race held on the road course at Indianapolis Raceway Park (IRP) on July 26, 1970 in Clermont, Indiana. (Photo by Alvis Upitis)Mark Donohue