@misc{indiciaef5ef98eda43a,
  title = {Geologic map of the SP Mountain part of the San Francisco Volcanic Field, north-central Arizona},
  author = {G. E. Ulrich and N. G. Bailey},
  year = {1987},
  doi = {10.3133/mf1956},
  url = {https://pubs.usgs.gov/publication/mf1956},
  note = {Source identifier: mf1956}
}