@misc{indiciae1583beaf56f0,
  title = {Geologic map of the Silent Butte quadrangle, Nye County, Nevada},
  author = {E. B. Ekren},
  year = {1964},
  doi = {10.3133/ofr6447},
  url = {https://pubs.usgs.gov/publication/ofr6447},
  note = {Source identifier: ofr6447}
}