S-13 Geologic map of the Lake Superior region, Minnesota, Wisconsin and northern Michigan, bedrock geology:

Morey, G.B.Sims, P.K.Cannon, W.F.Mudrey, M.G., Jr.Southwick, D.L.2010-03-262010-03-261982https://hdl.handle.net/11299/59786Scale 1:1,000,000en-USS-13 Geologic map of the Lake Superior region, Minnesota, Wisconsin and northern Michigan, bedrock geology:Map