Listerud, W.H.Meineke, David G.Ojakangas, Richard W.Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of the Birchdale-Indus Area, Minnesota, scale 1 inch = about 1/2 mile.PDFengMinnesota Geological SurveyPublicGeology, sulfide mineralization and geochemistry of the Birchdale-Indus area, Koochiching County, northwestern Minnesota, RI-17, Plate 1MapsMinnesota1977University of Minnesota