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DULUTH, Minn. - Registration for the 38th running of Grandma's Marathon closes May 31.

As of Thursday, the annual Two Harbors-to-Duluth race had more than 7,400 runners in the field.

Grandma's is the country's 16th largest marathon. This year's race will be held June 21.

Runners can sign up online. The entry fee is $110.

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