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Labor
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Minnesota Museum of Mining
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Construction of Memorial Park wall, Chisholm, Minnesota
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Iron miners by headframe of a mine entrance, Minnesota
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Joseph A. Holmes Safety Award Certificate to Leonard Burt Open Pit Mine, Oliver Iron Mining Company, Chisholm, Minnesota
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Joseph A. Holmes Safety Award Certificate to Sherman Open Pit MIne, Oliver Iron Mining Division, Chisholm, Minnesota
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Joseph A. Holmes Safety Award Certificate to Snyder Mining Company, Duluth, Minnesota
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Sentinel of Safety Award at the Crawford Mine, Hibbing, Minnesota
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United States Department of Interior, Bureau of Mines, Certificate of Award in Safety to Sherman Mine, United States Steel Corporation, Chisholm, Minnesota
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United States Department of Interior, Bureau of Mines, Certificate of Mine Rescue Training to Charles H. Isaacson, Virginia, Minnesota
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Iron Mines and Mining
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Industrial Safety
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Iron Miners
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Parks
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Minnesota Museum of Mining
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