Map showing surficial deposits and materials and state and county lines of Minnesota in central North America, from National Atlas Mapmaker [1] archive copy at the Wayback Machine, modified by submitter to show the Proglacial lakes of Minnesota, following Ojakangas, Richard R. and Matsch, Charles L. (1982) Minnesota's Geology, Minneapolis, MN: University of Minnesota Press, ISBN 0-8166-0953-5, p. 105. As to modifications, submitter releases all rights and specifically licenses use of this image under en:GNU Free Documentation License.

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