Aeromagnetic map of Minnesota, Cook and Lake counties, Plate 1
Description
Total magnetic intensity anomaly (relative to the earth's magnetic field), color coded, scale 1:250,000. 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.
Chandler, Val W. (1983). Aeromagnetic map of Minnesota, Cook and Lake counties, Plate 1. Minnesota Geological Survey. https://reflections.mndigital.org/catalog/mgs:634 (map)