@misc{indiciae41e8c251db9c,
  title = {Geologic map of the St. George Canyon Quadrangle, northern Mohave County, Arizona},
  author = {George H. Billingsley},
  year = {1991},
  doi = {10.3133/ofr91561},
  url = {https://pubs.usgs.gov/publication/ofr91561},
  note = {Source identifier: ofr91561}
}