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Alexander, E. Calvin, Jr.
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Boerboom, Terrence J.
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Minnesota Geological Survey
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Minnesota
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1. Geologic atlas of Pine County, Minnesota, C-13, Part A, Plate 6, Sinkhole distribution, Depth to Bedrock, and Bedrock Topography
2001. Boerboom, Terrence J., Shade, Beverley L., Alexander, E. Calvin, Jr., and Alexander, Scott C. Map showing the thickness (depth to bedrock) of unconsolidated sediments (Quaternary glacial and stream materials) over the bedrock surface and ele...