Map of the Copper Range of Northern Michigan including Keweenaw and Houghton Counties and Ontonagon County [Map Case Cover].

Map case cover. Map in separate image shows township grid, towns, town and county boundaries, landowners, railroads, canals, Michigan coastline along Lakes Michigan and Superior, mining activity, and the limits of the Copper Range; mine shafts in cross section; location of Kearsarge Lode in longitudinal section. Includes color key to major commercial holdings and cover. Insets: Geological section of Copper Range at Calumet; Longitudinal section of mines on Kearsarge Lode. Scale not given