1917. This map drawn from German sources (especially the All-Deutscher Atlas edited by Paul Langhans and published at Gotha by Justus Perthes in 1905) sh... Standard's Geographical Establishment (London).
1968. Map of Sub-Surface Geological Features prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropolitan Area... Wallace, McHarg, Roberts and Todd.
1986. Meyer, Gary N. Bedrock topography (elevation of the bedrock surface) and cross sections, Todd County, Minnesota, scale 1 inch = about 5 miles. Minnesota Geological Survey.
1695. Morden, Robert, approximately 1650-1703. Relief shown pictorially.; Detached from an edition of Camden, William. Camden's Britannia -- London, [1695-1772]. 35 x 41.2 centimeters Scale appr... (London).
1978. United States. Soil Conservation Service. Base source: USGS 1:100,000 county base map dated 1976; interpretations derived from soil map constructed 1975.; "Projection and 10,000-metre grid ... Dept. of Agriculture, Soil Conservation Service (Washington.).
1968. Map of Suitability for Extraction prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropolitan Area. Sca... Wallace, McHarg, Roberts and Todd.
1968. Map of Suitability for Forestry prepared for the Metropolitan Council as a part of An Ecological Study for the Twin-Cities Metropolitan Area. Scale... Wallace, McHarg, Roberts and Todd.