@misc{indiciae8390179530b9,
  title = {Airborne electromagnetic and magnetic survey of parts of the Upper Peninsula of Michigan},
  author = {William D. Heran and Geoterrex Limited},
  year = {1982},
  doi = {10.3133/ofr8260a},
  url = {https://pubs.usgs.gov/publication/ofr8260A},
  note = {Source identifier: ofr8260A}
}