Balaban, NancyOlsen, Bruce M.Map showing the thickness of unconsolidated materials over the bedrock surface (depth to bedrock) and the elevation of the bedrock surface (bedrock topography), scale 1:100,000, Olmsted County.PDFengMinnesota Geological SurveyPublicGeologic atlas of Olmsted County, Minnesota, C-3, Plate 4, Depth to BedrockMapsMinnesota1988University of Minnesota