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A resource for reliable information about significant people, places, events, and things in Minnesota history.
Worker monitoring a machine inside the 3M plant in New Ulm, July 1974. Public domain. From the records of the Environmental Protection Agency (EPA), 1944–2006, National Archives record group 412.
Made possible by the Arts and Cultural Heritage Fund through the vote of Minnesotans on November 4, 2008. Administered by the Minnesota Historical Society.
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