@misc{indiciae005c8949e442,
  title = {Hard iron ore at the Cliffs Shaft Mines, Ishpeming, Michigan},
  author = {Jacob Eugene Gair},
  year = {1974},
  doi = {10.3133/ofr74227},
  url = {https://pubs.usgs.gov/publication/ofr74227},
  note = {Source identifier: ofr74227}
}