Public domain This work has been released into the public domain by its author, The Minnesota Geological Survey. This applies worldwide.
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The Minnesota Geological Survey grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

The Minnesota Geological Survey has placed this image in the public domain with the request that credit be given to the Minnesota Geological Survey, University of Minnesota, and to the author(s) of the specific work. These images are available through the Minnesota Digital Library, "Minnesota Reflections". More information on the Minnesota Geological Survey map and report scanning project can be found here.
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