The Vermilion iron-bearing district of Minnesota : with an atlas Clements, J. Morgan (Julius Morgan), 1869- creator cartographic book Washington Gov't Print. Off 1903 1903
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ENG Geology Iron ores Minnesota Vermilion district QE75 .M7 vol.45 House document (United States. Congress. House), 57-433 Monographs of the United States Geological Survey, v. 45 https://www.biodiversitylibrary.org/bibliography/42496 https://www.biodiversitylibrary.org/bibliography/45701 555908 gs05000035 10.5962/bhl.title.45701 DLC