@misc{indiciaeed3f81335aeb,
  title = {Maps showing magnetic data for southern Dickinson County, Michigan},
  author = {Carl E. Dutton},
  year = {1960},
  doi = {10.3133/ofr6046},
  url = {https://pubs.usgs.gov/publication/ofr6046},
  note = {Source identifier: ofr6046}
}