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231. A new map of Michigan with its canals, roads & distances

Image University of Michigan Public content
1850. Thomas, Cowperthwait & Co.,Mitchell, S. Augustus (Samuel Augustus), 1792-1868. Washington prime meridian. "Entered according to Act of Congress, in the year 1850, by Thomas, Cowperthwait & Co., in the clerks Office of the Dist...

235. [Geology of the southern Michigan].

Image University of Michigan Public content
1850. unknown. Edges trimmed, possibly from a larger map showing railroads. Hand col. showing [geology?]. 1 map: col.; 28 x 25 cm. This map is in the public domai...