@misc{indiciae73a55db1459d,
  title = {Geologic map of the Tower quadrangle, St. Louis County, Minnesota},
  author = {Richard W. Ojakangas and P. K. Sims and Peter R. Hooper},
  year = {1978},
  doi = {10.3133/gq1457},
  url = {https://pubs.usgs.gov/publication/gq1457},
  note = {Source identifier: gq1457}
}