@misc{indiciae3c1c5e3ba23e,
  title = {Aeromagnetic map of a part of western Minnesota},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1970},
  doi = {10.3133/gp692},
  url = {https://pubs.usgs.gov/publication/gp692},
  note = {Source identifier: gp692}
}