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Geology of the metamorphosed Biwabik iron-formation, Eastern Mesabi district, Minnesota, Bulletin 43, Plate 1

Iron ores of Minnesota, their geology, discovery, development, qualities and origin, and comparison with those of other iron districts, Bulleitin 6, Plate 3

Iron ores of Minnesota, their geology, discovery, development, qualities and origin, and comparison with those of other iron districts, Bulletin 6, Plate 1

Iron ores of Minnesota, their geology, discovery, development, qualities and origin, and comparison with those of other iron districts, Bulletin 6, Plate 2