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1Published 1987Subjects: “...Geology Minnesota Maps....”
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2Published 1989Subjects: “...Geomagnetism Minnesota Maps....”
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3Published 1988Subjects: “...Gravity anomalies Minnesota Maps....”
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4Published 1990Subjects: “...Geology Minnesota International Falls Region Maps....”
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5Published 1994Subjects: “...Geology Minnesota Maps....”
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6Published 1995Subjects: “...Geology Minnesota Maps....”
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