Leverett, Frank, 1859-1943A. Hoen & Co. Baltimore.; Includes inset of Isle Royale and legend evaluating agricultural potential.28 x 55 centimetersJPEGUMN_ALMA:9935234150001701engGeological Survey of Michigan, in cooperation with the United States Geological Survey (Lansing, Mich)PublicMap of the surface formations of the Northern peninsula of MichiganMapsMichigan1911University of Minnesota