@misc{indiciae97c07d95a94e,
  title = {Geologic map of the Mustang Knoll quadrangle, northern Mohave County, Arizona},
  author = {George H. Billingsley},
  year = {1991},
  doi = {10.3133/ofr91560},
  url = {https://pubs.usgs.gov/publication/ofr91560},
  note = {Source identifier: ofr91560}
}