Smithsonian Archives
Monument Rock (Front View) Isle Royale
Ackerman, James 1815 or 1816-1864 · 1851
See "Report on the Geology and Topography of a Portion of the Lake Superior Land District in the State of Michigan, Part II, The Iron Region, Together with the General Geology," by J.W. Foster and J.D. Whitney, United States geologists, printed for the House of Representatives, Washington, D.C., 1851, Plate III.
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