Images Serverimages.library.wisc.edu/.../reference/wi.wt1972.dzochert.pdfhowever ; see Charles...
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Images Serverimages.library.wisc.edu/.../reference/wi.wt1972.dzochert.pdfhowever ; see Charles Schuchert, "The Progress of Historical Geology in North Amer- ica," in Edward Salisbury
