@misc{indiciae7af2d0d0b63c,
  title = {Aeromagnetic map of central Pine County, Minnesota, and adjacent parts of Wisconsin},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1968},
  doi = {10.3133/gp636},
  url = {https://pubs.usgs.gov/publication/gp636},
  note = {Source identifier: gp636}
}