1954. White, David A. (David Archer). Sheet 1 of 11 sheets, Structure contour (contour lines of equal elevation that map features in the subsurface produced by rock deformation or erosi... Minnesota Geological Survey.
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1954. White, David A. (David Archer). Sheet 2 of 11 sheets, Structure contour (contour lines of equal elevation that map features in the subsurface produced by rock deformation or erosi... Minnesota Geological Survey.
1954. White, David A. (David Archer). Sheet 3 of 11 sheets, Structure contour (contour lines of equal elevation that map features in the subsurface produced by rock deformation or erosi... Minnesota Geological Survey.
1954. White, David A. (David Archer). Sheet 4 of 11 sheets, Structure contour (contour lines of equal elevation that map features in the subsurface produced by rock deformation or erosi... Minnesota Geological Survey.
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.
2002. Chandler, Val W. Gravity (interpretation of gravity data collected with ground based meters indicating differences in rock density of rocks in the upper crust) and ... Minnesota Geological Survey.
2001. Chandler, Val W. Gravity (interpretation of gravity data collected with ground based meters indicating differences in rock density of rocks in the upper crust) and ... Minnesota Geological Survey.
2001. Chandler, Val W. Gravity (interpretation of gravity data collected with ground based meters indicating differences in rock density of rocks in the upper crust) and ... Minnesota Geological Survey.
1917. Leverett, Frank, 1859-1943 and Sardeson, Frederik W. Sheet 2, Map of the Surface (glacial landforms) Formations and agricultural conditions of northeastern Minnesota, scale 1:500,000. Minnesota Geological Survey.
1915. Leverett, Frank, 1859-1943. Map showing the Pioneer iron mine, surveyed July 13, 1889, scale 1 inch = about 6.25 feet. Minnesota Geological Survey.