http://www.rssboard.org/rss-specification 720 XTF Search Results (docsPerPage=100;f277-subject=Copper -- Michigan -- Ontonagon County) https://catalog.wrhs.org/collections/search?docsPerPage%3D100;f277-subject%3DCopper%20--%20Michigan%20--%20Ontonagon%20County Results for your query: docsPerPage=100;f277-subject=Copper -- Michigan -- Ontonagon County Thu, 01 Jan 1970 12:00:00 GMT Lone Rock property, Ontonagon County, Michigan, 1,000 acres: copper and silver belt. Whittlesey, Charles, 1808-1886 https://catalog.wrhs.org/collections/view?docId=marc/skclmarc202890322046876.mrc https://catalog.wrhs.org/collections/view?docId=marc/skclmarc202890322046876.mrc Thu, 01 Jan 1970 12:00:00 GMT