See her autobiography (1952) and study by O. Kallir (1973).
Grandma's Marathon is an annual road race held in late spring in Duluth, Minnesota, in the United States. The course runs point-to-point from the town of Two Harbors on Scenic Route 61 and continues along Lake Superior into the city of Duluth. The finish is located in Canal Park, near Grandma's Restaurant, which is next to the highly visible Aerial Lift Bridge.
Grandma's was first run in 1977 with only 150 participants; the first race was won by the famous Minnesotan runner Garry Bjorklund. Since Grandma's Restaurant sponsored the race, it became its namesake. At the present time, Grandma's Marathon is run by almost 10,000 runners every year.
Grandma's Marathon also includes other running events in addition to the full marathon. These include the Garry Bjorklund Half Marathon, the William A. Irvin 5k, the Fitger's 5k, the Park Point 5 Miler, and the Grandma's Minnesota Mile, as well as several "whipper snapper" races for kids.