@misc{indiciaef900f83a4595,
  title = {Geology of the northern Crystal Falls area, Iron County, Michigan},
  author = {F.J. Pettijohn},
  year = {1952},
  doi = {10.3133/cir153},
  url = {https://pubs.usgs.gov/publication/cir153},
  note = {Source identifier: cir153}
}