images.library.wisc.eduimages.library.wisc.edu/EcoNatRes/EFacs/GeologyWI/... · The area of the...
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images.library.wisc.eduimages.library.wisc.edu/EcoNatRes/EFacs/GeologyWI/... · The area of the region, here called the Western Lake Superior Dis- trict, is about 1,500 square miles