SEBEKA, Minn. -- On a field in northeast Otter Tail County, Minn., littered with field stones ranging from pebbles to volleyballs, the RP 1000 moves onward and then upward. A curious, self-propelled ...
DULUTH — About 1.1 billion years ago here, fissures opened in the surface of the earth, depositing lakes of molten rock near what would eventually be the Twin Ports and Lake Superior. This is ...
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