@misc{indiciae196e9cbdd025,
  title = {Chalcopyrite in rocks associated with magnetic iron-formation in Wisconsin},
  author = {Carl E. Dutton},
  year = {1974},
  doi = {10.3133/ofr757},
  url = {https://pubs.usgs.gov/publication/ofr757},
  note = {Source identifier: ofr757}
}