71. 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.