@misc{indiciae411356ac304e,
  title = {Geologic map of the Prescott 30- x 60-minute quadrangle, Arizona},
  author = {G. H. Billingsley and C. M. Conway and L. S. Beard},
  year = {1988},
  doi = {10.3133/ofr88372},
  url = {https://pubs.usgs.gov/publication/ofr88372},
  note = {Source identifier: ofr88372}
}