[creator not identified]Edges trimmed, possibly from a larger map showing railroads. Hand col. showing [geology?]. 1 map: col.; 28 x 25 cm.JPEGe2d5f1e9-da48-4855-a1af-64be71b3f6ecengPublicRailroads[Geology of the southern Michigan].MapsMichiganbetween 1850 and 1900University of Michigan