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Blue line copy of a road map of Mecosta County, Michigan that has been hand colored to show glacial soils as understood about the year 1945. The scale on the original os .75 inches equals 1 mile.

Printed color map of Michigan showing the location of the coal basin as well as glacial formations as understood in 1906. The scale on the original is 1 inch equals 56 miles.

Reproduction of a geologic map of Ogemaw County in 1923. Glacial geology is emphasized. The scale on the original is 1 inch equals 1.5 miles.

Reproduction of a map showing the glacial geology of Luce County, Michigan as understood in 1929. The scale on the original is 1 inch equals 1 mile.

Reproduction of a geological map of Luce County, Michigan as understood in 1929. The scale on the original is 1 inch equals 1 mile.

Reproduction of a glacial geology map of Alger County, Michigan for 1928. The scale on the original is 1 inch equals 1 mile.

Hand colored blue line copy map showing the locations of oil wells in Ogemaw County, Michigan about the year 1945. The scale on the original is 1 inch equals 1 mile.

Blue line copy of a road map of Houghton County, Michigan for the year 1923 that has been hand colored to show glacial soils as understood about the year 1945. The scale on the original is 1 inch equals 1 and one half mile.

Reproduction of a highway map of Bay County, Michigan in 1917. This map was used as a base map and hand colored to show soil types in Bay county. The scale on the original is .75 inches equals 1 mile.

Hand colored and hand annotated blue line copy of a road map of Gladwin County, Michigan. The hand additions are showing the glacial geology of the county as understood about the year 1940. The scale on the original is .75 inches equals 1 mile.

Hand colored and hand annotated blue line copy of a road map of Gladwin County, Michigan. The hand additions are showing the glacial geology of the county as understood about the year 1940. The scale on the original is .75 inches equals 1 mile.

Hand colored geological map onto an ozzlid process highway map used as a base for 1953. The scale on the original is 1 inch equals 1 mile.

Printed color map showing the glacial formations of the lower peninsula of Michigan as understood in 1924. The scale on the original is 1 inch equals 12 miles.

Hand colored maps onto a reproduction of a base map of Baraga County, Michigan. The coloring denotes rock types as understood about the year 1930. The scale on the original is 1 inch equals 2 miles.

Hand colored maps onto a reproduction of a base map of Baraga County, Michigan. The coloring denotes rock types as understood about the year 1930. The scale on the original is 1 inch equals 2 miles.

Hand colored maps onto a reproduction of a base map of Baraga County, Michigan. The coloring denotes rock types as understood about the year 1930. The scale on the original is 1 inch equals 2 miles.

Hand colored maps onto a reproduction of a base map of Baraga County, Michigan. The coloring denotes rock types as understood about the year 1930. The scale on the original is 1 inch equals 2 miles.

Reproduction of a map of Roscommon County, Michigan showing the soil types and surface geology as known in 1925. The scale on the original is .75 inches equals 1 mile.

Blue line copy of a hand stenciled map showing the glacial contour lines of the Northville-Dearborn region in Wayne and Oakland Counties, Michigan about the year 1935. This map has been hand annotated to show potential natural gas formations. The scale on the original is 1 inch equals 1 mile.

Printed color map showing the geological features of the Lower Peninsula of Michigan as understood in 1907. Map is divided into four pieces. No scale given.

Printed color map showing the geological features of the Lower Peninsula of Michigan as understood in 1907. Map is divided into four pieces. No scale given.