@misc{indiciaee811b9b5f7fa,
  title = {Geologic map of the Silver Cliff and Rosita volcanic centers, Custer County, Colorado},
  author = {W. N. Sharp},
  year = {1978},
  doi = {10.3133/i1081},
  url = {https://pubs.usgs.gov/publication/i1081},
  note = {Source identifier: i1081}
}