@misc{indiciaed92cd2d1c8bb,
  title = {Records of massive sulfide occurrences in Arizona},
  author = {Michael E. Donnelly and Clay M. Conway and Robert L. Earhart},
  year = {1987},
  doi = {10.3133/ofr87406},
  url = {https://pubs.usgs.gov/publication/ofr87406},
  note = {Source identifier: ofr87406}
}