(CARTOGRAPHY) (RAILROADS) Cram's township and rail road map of Michigan. Chicago: George F. Cram, circa 1890. Folding map (60 x 48 cm., sheet), with 24 page index. Original paper covers worn and discolored. With two insets: Isle Royale in Lake Superior and a map of the upper peninsula. The text describes the routes of the 29 railroad lines that were operating at the time.