@misc{indiciaeafe90f3319aa,
  title = {Aeromagnetic map of central Gogebic County, Michigan, and vicinity},
  author = {P. W. Philbin and Joseph L. Vargo},
  year = {1963},
  doi = {10.3133/ofr63108},
  url = {https://pubs.usgs.gov/publication/ofr63108},
  note = {Source identifier: ofr63108}
}