@misc{indiciae4b9f78ec0b15,
  title = {Geologic map of the Silver Bell and West Silver Bell mountains, southern Arizona},
  author = {David A. Sawyer},
  year = {1996},
  doi = {10.3133/ofr966},
  url = {https://pubs.usgs.gov/publication/ofr966},
  note = {Source identifier: ofr966}
}