@misc{indiciae526bdc61b94d,
  title = {Sampling of copper-bearing Keweenawan rocks of northwestern Wisconsin},
  author = {Carl E. Dutton},
  year = {1972},
  doi = {10.3133/ofr7298},
  url = {https://pubs.usgs.gov/publication/ofr7298},
  note = {Source identifier: ofr7298}
}