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1.- Development of magnetite in iron - formations of the Lake superior region LaBerge, Gene L. Ver registro
2.- The Gogebic Iron Range: a sample of the northern margin of the Penokean fold and thrust belt Cannon, William F.; LaBerge, Gene L.; Klasner, John S.; Schulz, Klaus J. Reston (Virginia): U.S. Geological Survey, 2008 U.S. Geological Survey Professional Paper Revistas Ver registro
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