1980. Ervin, C. Patrick, Ikola, Rodney J., 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.
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1980. Ervin, C. Patrick. 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.
1980. Chandler, Val W., Ervin, C. Patrick, and Van De Voorde, B.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.