1920 6 10 Small Engines Cut Pit Stops in Half by Roy E. Berg MOTOR AGE
1920 6 10 Indy 500 Small Engines Cut Pit Stops in Half by Roy E. Berg article MOTOR AGE 8.5″×11.25″ page 11
1920 6 10 Indy 500 Small Engines Cut Pit Stops in Half by Roy E. Berg article MOTOR AGE 8.5″×11.25″ pages 12 13