@misc{indiciaeef05f3ca4f31,
  title = {Total intensity aeromagnetic map of Douglas County and part of Grant County, Minnesota},
  author = {J. R. Balsley and M. E. Hill and J. L. Meuschke},
  year = {1951},
  doi = {10.3133/gp51},
  url = {https://pubs.usgs.gov/publication/gp51},
  note = {Source identifier: gp51}
}