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1. 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.

2. 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.

3. 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.