1977 USAC Indycar Series.: 1977 USAC Indycar Series. Mosport Park, Canada. 3rd July 1977. Al Unser sr (Parnelli-Cosworth), 17th position/Retired. World Copyright: Murenbeeld/LAT Photographic
1977 USAC Indycar Series.
Mosport Park, Canada. 3rd July 1977.
Al Unser sr (Parnelli-Cosworth), 17th position/Retired.
World Copyright: Murenbeeld/LAT Photographic