1955. 2011-04-11T17:36:25Z. 2012-02-13T19:41:27Z. Cornwall, Henry Rowland, 1913-. U.S. Geological Survy. English. Public. Michigan and Keweenaw County.
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2. Geologic map of the Manitou Island quadrangle, Michigan bedrock geology / [cartographic material]
1955. 2011-04-11T17:30:33Z. 2012-02-13T19:41:27Z. Cornwall, Henry Rowland, 1913-. U.S. Geological Survey. English. Public. Michigan and Keweemaw County.
