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31.

Aeromagnetic map of Minnesota, central region, Plate 2 Maps maps university-of-minnesota

1985. Chandler, Val W. Total magnetic intensity anomaly, contour, scale 1:250,000. Interpretation of magnetic data collected from airborne surveys, the map contours (line... Minnesota Geological Survey.

34.

Aeromagnetic map of Minnesota, east-central region, Plate 1 Maps maps university-of-minnesota

1983. Chandler, Val W. Total magnetic intensity anomaly (relative to the earth's magnetic field), color coded, scale 1:250,000. Interpretation of magnetic data collected... Minnesota Geological Survey.

35.

Aeromagnetic map of Minnesota, east-central region, Plate 2 Maps maps university-of-minnesota

1983. Chandler, Val W. Total magnetic intensity anomaly, contour, scale 1:250,000. Interpretation of magnetic data collected from airborne surveys, the map contours (line... Minnesota Geological Survey.