@misc{indiciaef2a6b3eb0c32,
  title = {Aeromagnetic map of part of northwestern Wisconsin and adjacent areas},
  author = {S. L. Snyder},
  year = {1998},
  doi = {10.3133/ofr98228},
  url = {https://pubs.usgs.gov/publication/ofr98228},
  note = {Source identifier: ofr98228}
}