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591. Surface formations and agricultural conditions of northwestern Minnesota, Bulletin 12, Plate 1
1915. Leverett, Frank. Map showing the Pioneer iron mine, surveyed July 13, 1889, scale 1 inch = about 6.25 feet.
592. Iron ores of Minnesota, their geology, discovery, development, qualities and origin, and comparison with those of other iron districts, Bulleitin 6, Plate 3
1891. Winchell, Newton H. and Winchell, Horace V. Map showing the Pioneer iron mine, surveyed July 13, 1889, scale 1 inch = about 6.25 feet.
593. Iron ores of Minnesota, their geology, discovery, development, qualities and origin, and comparison with those of other iron districts, Bulletin 6, Plate 1
1891. Winchell, Newton H. and Winchell, Horace V. Map of northeastern Minnesota showing iron regions, scale 1 inch = about 4.5 miles.
594. Iron ores of Minnesota, their geology, discovery, development, qualities and origin, and comparison with those of other iron districts, Bulletin 6, Plate 2
1891. Winchell, Newton H. and Winchell, Horace V. Map showing iron mines in the Vermilion range, scale 1 inch = about 0.12 miles.
595. Preliminary geological map of Minnesota
1872. Winchell, Newton H., 1839-1914. Geologic map of Minnesota, scale 1 inch = 20 miles.