Geologic map of Minnesota, quaternary geology [cartographic material] / by Howard C. Hobbs and Joseph E. Goebel.
"Based modified from U.S. Geologic Survey 1:500,000, Minnesota edition, 1965." "Prepared in part with the support of the National Aeronautics and Space Administration, NASA Grant NGL-24-005-263, to the Space Science Center, University of Minnesota. Published with the support of the Legislative Commission on Minnesota Resources and the U.S. Department of Energy."
- Minnesota Geological Survey, University of Minnesota
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