1916 6 29 De Palma Wins Second Annual Des Moines Speedway Race MOTOR AGE

1916 6 29 HOUK WIRE WHEELS MOTOR AGE page 125
1916 6 29 HUDSON De Palma Wins Second Annual Des Moines Speedway Race MOTOR AGE page 14
1916 6 29 HUDSON De Palma Wins Second Annual Des Moines Speedway Race MOTOR AGE page 15