Mitchell, S. Augustus (Samuel Augustus), 1792-1868Thomas, Cowperthwait & Co.Washington prime meridian. "Entered according to Act of Congress, in the year 1850, by Thomas, Cowperthwait & Co., in the clerks Office of the District Court of the Eastern District of Pennsylvania." Includes list of steam boat routes with distances. 30. in upper right margin. Inset: Western part of michigan [ca. 1:3,000,000] 1 map: col.; 34 x 27 cmJPEGae23393c-a4b9-4191-8473-ec4eef4d453aengPublicA new map of Michigan with its canals, roads & distancesMapsMichigan1850University of Michigan