Chandler, Val W.Shaded-relief, (pseudo 3d), black and white map of Aeromagnetic anomaly (total magnetic intensity anomaly (relative to the earth's magnetic field, interpretation of magnetic data collected from airborne surveys, the map colors indicate the distribution and concentration of magnetic minerals (primarily iron-bearing) within the upper crust of the earth) in Minnesota, scale 1:1,000,000.PDFengMinnesota Geological SurveyPublicShaded-relief aeromagnetic anomaly maps of Minnesota, S-18MapsMinnesota1991University of Minnesota