3M worker monitoring a machine

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.

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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.

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National Archives

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