1999. Jirsa, Mark A. and Peterson, Dean M. Compilation of interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments), mineral exploration dat... Minnesota Geological Survey.
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1999. Chandler, Val W., Jirsa, Mark A., and Runkel, Anthony C. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of northwestern Minnesota, scale 1:200,... Minnesota Geological Survey.
3. Bedrock geologic map of the Aitkin 30 x 60 minute quadrangle, east-central Minnesota, M-99, Plate 1
1999. Boerboom, Terrence J., Severson, Mark J., and Southwick, David L. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) Aitkin quadrangle, scale 1:100,000. Minnesota Geological Survey.
4. Bedrock geologic map of the Aitkin 30 x 60 minute quadrangle, east-central Minnesota, M-99, Plate 2
1999. Boerboom, Terrence J., Severson, Mark J., and Southwick, David L. Data base, Aitkin quadrangle showing drill holes, outcrops and other data used to make interpretations of bedrock geology for map M-99, scale 1:100... Minnesota Geological Survey.
1999. Miller, James D., Jr. and Severson, Mark J. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of the Allen quadrangle, scale 1:24,000. Minnesota Geological Survey.
1999. Chandler, Val W. and Miller, James D., Jr. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of part of the Duluth Complex, scale 1:... Minnesota Geological Survey.
1999. Boerboom, Terrence J., Severson, Mark J., and Southwick, David L. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) Mille Lacs quadrangle, scale 1:100,000. Minnesota Geological Survey.
1999. Boerboom, Terrence J., Severson, Mark J., and Southwick, David L. Data base, Mille Lacs quadrangle showing drill holes, outcrops and other data used to make interpretations of bedrock geology for map M-100, scale ... Minnesota Geological Survey.
9. Geology of the Root River State Trail area, southeastern Minnesota, Educational Series-10, Plate 1
1999. Mossler, John H. Front, Sites of geologic interest along the Root River State Trail, southeastern Minnesota, West half, scale 1 inch = 1/2 mile. Minnesota Geological Survey.
10. Geology of the Root River State Trail area, southeastern Minnesota, Educational Series-10, Plate 2
1999. Mossler, John H. Back, Sites of geologic interest along the Root River State Trail, southeastern Minnesota, Eest half, scale 1 inch = 1/2 mile. Minnesota Geological Survey.
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