in Minnesota National Register of Historic Places listings in St. Louis County, Minnesota List of Minnesota state parks References External links Soudan Iron formation geology, photo galleries: , , Lake Vermilion-Soudan Underground Mine State Park National Register of Historic Places: Mines: Soudan Mine Soudan Underground Laboratory Deep Underground Science and Engineering Laboratory (proposed) Tower Soudan Historical Society NHL summary Cleanup underway at Soudan Mine Fire Scientists reenter Soudan Underground Laboratory 1963 establishments in Minnesota Historic American Engineering Record in Minnesota Industrial buildings and structures on the National Register of Historic Places in Minnesota Iron mines in the United States Laboratories in the United States Mining museums in Minnesota Museums in St. Louis County, Minnesota National Historic Landmarks in Minnesota Protected areas established in 1963 Protected areas of St. Louis County, Minnesota State parks of Minnesota Underground laboratories Underground mines in the United States University of Minnesota Mines in Minnesota National Register of Historic Places in St. Louis County, Minnesota