Washington and Greenwich prime meridians. Shows major cities and towns. Shows counties in Michigan and Wisconsin. Inset maps: Map of Isle Royale Co., Mich. -- The vicinity of Milwaukee. -- The Vicinity of Detroit, Mich., and Detroit River. 1 map: col., mounted on cloth; 27 x 45 cm This map is in the public domain. Please attribute access and use of this digitized map to the Stephen S. Clark Library, University of Michigan Library.