@misc{indiciae3b6380179e92,
  title = {Geologic map of the Silent Butte quadrangle, Nye County, Nevada},
  author = {E. B. Ekren},
  year = {1966},
  doi = {10.3133/gq493},
  url = {https://pubs.usgs.gov/publication/gq493},
  note = {Source identifier: gq493}
}