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Image Description: | Soudan, Minnesota - The former U.S. Steel Soudan iron ore mine, now the Soudan Underground Mine State Park. Visitors can descend half a mile underground to tour the mine or visit the Soudan Underground Laboratory where scientists research the fundamental structure of the universe. Tour guide Laura Chickdrum stands next to a "men only" sign from the mine's operating days when women would not have been in the mine. |
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