@misc{indiciaed90bb4647ae0,
  title = {Aeromagnetic map of the McNair-Grand Portage area, northeastern Minnesota},
  author = {C. L. Kruger},
  year = {1968},
  doi = {10.3133/ofr68287},
  url = {https://pubs.usgs.gov/publication/ofr68287},
  note = {Source identifier: ofr68287}
}