Minnesota Geological Survey Open-File Report 01-1. Hydrostratigraphic and hydraulic characterization of Paleozoic bedrock at nine southeastern Minnesota communities: Research in support of wellhead protection, by A.C. Runkel, and J.H. Mossler. 2001. The pdf report should be viewed using Acrobat Reader 3.0 or higher for best results. If necessary, download this file as binary, not ASCII format. Also available as a printed report; contact the MGS Map Sales office at 612-627-4782 for price and availability.