@misc{indiciae60f8ef6bb241,
  title = {Map showing mineral deposits of the midcontinent rift, Lake Superior region, United States and Canada},
  author = {W.F. Cannon and T. A. McGervey},
  year = {1991},
  doi = {10.3133/mf2153},
  url = {https://pubs.usgs.gov/publication/mf2153},
  note = {Source identifier: mf2153}
}