Please attribute access and use of this digitized map to the Stephen S. Clark Library, University of Michigan Library. https://www.lib.umich.edu/about-us/policies/copyright-policy
Jackson, Charles T. (Charles Thomas), 1805-1880 (n.d.). Geological map of Keweenaw Point, Lake Superior.. . https://quod.lib.umich.edu/c/clark1ic/x-003287269/39015091881212 (map)