@misc{indiciae913fae95d279,
  title = {Geologic map of the Soudan quadrangle, St. Louis County, Minnesota},
  author = {P.K. Sims and D. L. Southwick},
  year = {1980},
  doi = {10.3133/gq1540},
  url = {https://pubs.usgs.gov/publication/gq1540},
  note = {Source identifier: gq1540}
}