@misc{indiciae4f0f4b620a7c,
  title = {Areal geology of the Placerville quadrangle, San Miguel County, Colorado},
  author = {Alfred Lerner Bush and C. S. Bromfield and Charles Thomas Pierson},
  year = {1959},
  doi = {10.3133/b1072e},
  url = {https://pubs.usgs.gov/publication/b1072E},
  note = {Source identifier: b1072E}
}