@misc{indiciaef77400c9c394,
  title = {Geologic map of the Tombstone Volcanic Center, Cochise County, Arizona},
  author = {R. B. Moore},
  year = {1993},
  doi = {10.3133/i2420},
  url = {https://pubs.usgs.gov/publication/i2420},
  note = {Source identifier: i2420}
}