@misc{indiciae7c0017491f99,
  title = {Preliminary geologic map and sections of the Bullfrog quadrangle, Nevada-California},
  author = {H. R. Cornwall and F. J. Kleinhampl},
  year = {1961},
  doi = {10.3133/mf177},
  url = {https://pubs.usgs.gov/publication/mf177},
  note = {Source identifier: mf177}
}