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1. Geologic map of Minnesota, bedrock topography, S-15

1982. Olsen, Bruce M. and Mossler, John H. Bedrock topography (elevation of the bedrock surface) map of Minnesota, scale 1:1,000,000.

2. Geologic map of Minnesota, depth to bedrock, S-14

1982. Olsen, Bruce M. and Mossler, John H. Depth to bedrock (thickness of unconsolidated sediments overlying bedrock) map of Minnesota, scale 1:1,000,000.