Rock property data can be viewed and obtained by going to the Minnesota Geological Survey web page at http://mngs.umn.edu and following the link to online data services.
Chandler, V.W.; Lively, R.S..
Density, Magnetic Susceptibility, and Natural Remanent Magnetization of Rocks in Minnesota: An MGS Rock Properties Database.
Minnesota Geological Survey.
Retrieved from the University of Minnesota Digital Conservancy,
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