@misc{indiciaeb7f4cc10619a,
  title = {Geologic map of the Jumpup Canyon and Big Springs quadrangles, Mohave and Coconino counties, Arizona},
  author = {G. H. Billingsley},
  year = {1990},
  doi = {10.3133/ofr90258},
  url = {https://pubs.usgs.gov/publication/ofr90258},
  note = {Source identifier: ofr90258}
}