@misc{indiciaeae47e75deb09,
  title = {Preliminary geologic map of the Purgatory Canyon Quadrangle, Mohave County, Arizona},
  author = {M.L. Throckmorton},
  year = {1982},
  doi = {10.3133/mf1138},
  url = {https://pubs.usgs.gov/publication/mf1138},
  note = {Source identifier: mf1138}
}