Shaded relief image of Minnesota in central North America, from National Atlas Mapmaker [1] archive copy at the Wayback Machine, modified to show generalized view of geologic regions, after Sansome, Constance J. (1983) Minnesota Underfoot: A Field Guide to the State's Outstanding Geologic Features, Stillwater, MN: Voyageur Press, ISBN 0-8965-8036-9; and (with respect to northern boundary of Southwest Minnesota) Ojakangas, Richard R. and Matsch, Charles L. (1982) Minnesota's Geology, Minneapolis, MN: University of Minnesota Press, ISBN 0-8166-0953-5. As to modifications, submitter releases all rights and specifically licenses use of this image under en:GNU Free Documentation License.

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