@misc{indiciaedd8769e1a474,
  title = {Geologic map of the South Fork area, eastern San Juan Mountains, southwestern Colorado},
  author = {P. W. Lipman and T. A. Steven},
  year = {1976},
  doi = {10.3133/i966},
  url = {https://pubs.usgs.gov/publication/i966},
  note = {Source identifier: i966}
}