@misc{indiciae1089a160d616,
  title = {Aeromagnetic and geologic map of northwestern Minnesota},
  author = {G. D. Bath and G. M. Schwartz and F. P. Gilbert},
  year = {1964},
  doi = {10.3133/gp471},
  url = {https://pubs.usgs.gov/publication/gp471},
  note = {Source identifier: gp471}
}