Walling, H. F. (1873). "Upper Peninsula, Scale six Miles to an Inch, Isle Royale (and Keweenaw Co.)" (Map). Atlas of the State of Michigan, Including Statistics and Descriptions of Its Topography, Hydrology, Climate, Natural and Civil History, Railways, Educational Institutions, Material Resources, etc. 1:380,160. Detroit: R.M. & S.T. Tackabury. p. 118. Retrieved August 2, 2023 – via David Rumsey Map Collection.