@misc{indiciaeffdc381a0d3e,
  title = {Placerville quadrangle, Colorado},
  author = {A.L. Bush and C. S. Bromfield and C. T. Pierson},
  year = {1956},
  doi = {10.3133/mf96},
  url = {https://pubs.usgs.gov/publication/mf96},
  note = {Source identifier: mf96}
}