@misc{indiciaeb586c1ad5431,
  title = {Breccia-pipe and geologic map of the southwestern part of the Hualapai Indian Reservation and vicinity, Arizona},
  author = {G. H. Billingsley},
  year = {1999},
  doi = {10.3133/i2554},
  url = {https://pubs.usgs.gov/publication/i2554},
  note = {Source identifier: i2554}
}