Finlayson

1981

1:24k

Sandstone

1961

1:63k

Sandstone

1961

1:63k

Sandstone

1980

1:100k

Duluth

1958

1:250k

Duluth

1953

1:250k

Duluth

1953

1:250k

Educational map of the state of Wisconsin

1875

Searing, Edward

1:380k

A Geological Map of Wisconsin

1855

Lapham, Increase Allen

1:2m

Karte von Wisconsin

1860

Meyer, J.