1984. Anderson, S. (Geologist), Chandler, Val W., and Nordstrand, E. Aeromagnetic anomaly map, (relative to the earth's magnetic field, interpretation of magnetic data collected from airborne surveys, the map colors... Minnesota Geological Survey.
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1991. 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, ... Minnesota Geological Survey.
1984. Lively, R. S., Morey, G.B., Mossler, John H., Ojakangas, Richard W., Southwick, David L., and Weber, R.E. (Geologist). Generalized interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of the North Limb, Cottonwo... Minnesota Geological Survey.
1982. Chandler, Val W. Bouguer gravity anomaly map (anomaly related to different densities of rocks in the upper crust, Bouguer anomaly is a corrected difference between ... Minnesota Geological Survey.
1978. Ervin, C. Patrick, McGinnis, Lyle D. (Lyle David), 1931-2017, and Steffy, D.A. Bouguer gravity anomaly map (anomaly related to different densities of rocks in the upper crust, Bouguer anomaly is a corrected difference between ... Minnesota Geological Survey.
1978. Ervin, C. Patrick, Jackson, J. K. (Jeffrey K.), and McGinnis, Lyle D. (Lyle David), 1931-2017. Bouguer gravity anomaly map (anomaly related to different densities of rocks in the upper crust, Bouguer anomaly is a corrected difference between ... Minnesota Geological Survey.
1977. Ervin, C. Patrick and Krenz, Kelly A. Bouguer gravity anomaly map (anomaly related to different densities of rocks in the upper crust, Bouguer anomaly is a corrected difference between ... Minnesota Geological Survey.
1968. Ikola, R.J. Bouguer gravity anomaly map (anomaly related to different densities of rocks in the upper crust, Bouguer anomaly is a corrected difference between ... Minnesota Geological Survey.
1985. Chandler, Val W., Ikola, Rodney J., and Jirsa, Mark A. Bouguer gravity anomaly map (anomaly related to different densities of rocks in the upper crust, Bouguer anomaly is a corrected difference between ... Minnesota Geological Survey.
1987. Chandler, Val W., Ferderer, Robert J., and Mills, Sarah J. Bouguer gravity anomaly map (anomaly related to different densities of rocks in the upper crust, Bouguer anomaly is a corrected difference between ... Minnesota Geological Survey.