@misc{indiciae0f585cf54943,
  title = {Age of native copper mineralization, Keweenaw Peninsula, Michigan},
  author = {Theodore J. Bornhorst and James B. Paces and Norman K. Grant and J. Obradovich and N. King Huber},
  year = {1988},
  doi = {10.2113/gsecongeo.83.3.619},
  url = {https://pubs.usgs.gov/publication/70206764},
  note = {Source identifier: 70206764}
}