Portland Grand Prix ended in 2006.
Grand Prix of Portland ended in 2007.
Portland Grand Prix was created in 1978.
Grand Prix of Portland was created in 1984.
The duration of Grand Prix of Portland is 1.75 hours.
Grand Prix of Charlotte ended in 2000.
Meadowlands Grand Prix ended in 1991.
Detroit Grand Prix ended in 1988.
Grand Prix of Sonoma ended in 2008.
Czechoslovakian Grand Prix ended in 1988.
Grand Prix of Minnesota ended in 1998.
Austrian Grand Prix ended in 2003.
Taipei Grand Prix ended in 1992.