Sulfide mining in Upper Great Lakes
DuPont Barksdale and Chequamegon Projects Update December 12, 2007 DuPont CRG Great Lakes Visitors Center.
DuPont Barksdale and Chequamegon Projects Update July 22, 2008 DuPont CRG.
Former DuPont Barksdale Works Project Update
DuPont Barksdale and Chequamegon Projects Update
Former DuPont Barksdale Works Project Update June 07, 2006 Great Lakes Visitors Center DuPont CRG.
