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 Minnesota ended in 1998.
Austrian Grand Prix ended in 2003.
Dutch Grand Prix ended in 1985.
Grand Prix of Charlotte ended in 2000.
Meadowlands Grand Prix ended in 1991.
Prost Grand Prix ended in 2002.
Tripoli Grand Prix ended in 1940.
Cologne Grand Prix ended in 1986.