Michigan Copper in the Mediterranean Graham Hancock
Martin, S.R., Wonderful Power, The Story of Ancient Copper Working in the Lake Superior Basin, Wayne State Univ. Press, Detroit, 1999 (ISBN 0-8143-2843-1) 12. Trevelyan, A.M., Miskwabik, Metal of Ritual, Metallurgy in Precontact Eastern North America, U. Press of Kentucky, Louisville, 2004 (ISBN 0