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Minnesota, United States
45
Ohio, United States
25
Pennsylvania, United States
10
Indiana, United States
6
Ohio,United States
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Geospatial data
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Geoscientific Information
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1950-1999
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2015-present
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University of Minnesota
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State of Ohio
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State of Minnesota
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Minnesota Geological Survey
39
Ohio Geographically Referenced Information Program
25
Minnesota Department of Natural Resources (DNR)
6
Indiana Geological Survey
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Pennsylvania Department of Conservation and Natural Resources
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Setterholm, D.R
4
Setterholm, Dale, R
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100
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41
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