Collection, 1911-1978, compiled by Louis Koepel, a resident and historian of Michigan's Copper Country. Includes Securities and Exchange Commission filings for the merger of the Copper Range Company with Louisiana Land and Exploration Company, SEC paperwork for the Calumet and Hecla, Inc. sale to Universal Oil Products, auction catalogs for disposition of the W. Parsons Todd Collection, parts catalogs, patents. Also includes blueprints for the J. P. Cooper house in East Hancock, Michigan.