@misc{indiciae94e2aeb6cf6e,
  title = {Geologic map of the Mount Trumbull NW Quadrangle, northern Mohave County, Arizona},
  author = {G. H. Billingsley},
  year = {1997},
  doi = {10.3133/ofr97488},
  url = {https://pubs.usgs.gov/publication/ofr97488},
  note = {Source identifier: ofr97488}
}