Scope and Contents From the Collection: The Calumet Mining and Refining Company records contain correspondence, memoranda, plant blueprints and flow charts, mining equipment brochures, research materials (such as articles, reports and news clippings), maps, and ledgers. Also included are some personal materials of Corwin H. Likins who held several authoritative positions both with the Combined Metals Reduction Company and the Calumet Mining and Refining Company. Much of the content of this collection also pertains to the Combined...