@misc{indiciaedb17bf0916db,
  title = {Aeromagnetic map of parts of Clay, Wilkin, and Otter Tail Counties, Minnesota},
  author = {L. A. Anderson and Frank Petrafeso},
  year = {1963},
  doi = {10.3133/gp327},
  url = {https://pubs.usgs.gov/publication/gp327},
  note = {Source identifier: gp327}
}