1995. 2002-06-01T04:00:00Z. 2016-07-26T21:18:50Z. Geological Survey (U.S.). The Survey ; For sale by Map Distribution. English. cartographic image. Public. Minnesota, Ontario, Manitoba, États-Unis, Canada, Ontario (Canada), Manitoba., Minnesota., and Ontario. Quaternary and From 2 million years ago.
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1984. 2016-06-21T14:49:32Z. 2016-09-26T17:42:52Z. State of Michigan, Dept. of Natural Resources, Geological Survey. English. cartographic image. Public. Michigan, Michigan., and États-Unis. Quaternary and From 2 million years ago.