Winchell, Horace V. (Horace Vaughn), 1865-1923Winchell, N. H. (Newton Horace), 1839-1914Map showing the Pioneer iron mine, surveyed July 13, 1889, scale 1 inch = about 6.25 feet.PDFengMinnesota Geological SurveyPublicIron ores of Minnesota, their geology, discovery, development, qualities and origin, and comparison with those of other iron districts, Bulleitin 6, Plate 3MapsMinnesota1891University of Minnesota