@misc{indiciae920b03d36e5b,
  title = {Geology of the central part of the Iron River District, Iron County, Michigan},
  author = {Carl E. Dutton},
  year = {1949},
  doi = {10.3133/cir43},
  url = {https://pubs.usgs.gov/publication/cir43},
  note = {Source identifier: cir43}
}