@misc{indiciae57fae18e116d,
  title = {Aeromagnetic surveying in Wisconsin 1998-99: Digital data files},
  author = {R. E. Bracken and S. W. Nicholson},
  year = {1999},
  doi = {10.3133/ofr99527},
  url = {https://pubs.usgs.gov/publication/ofr99527},
  note = {Source identifier: ofr99527}
}