1975. 2012-04-27T19:10:52Z. 2012-05-03T15:42:27Z. Geological Survey (U.S.). The Survey. English. Public. Michigan and Marquette County.
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1975. 2013-06-14T17:41:53Z. 2013-06-14T17:41:53Z. Cannon, William F. The Survey. English. Public. Michigan and Marquette County.
