@misc{indiciaebdbd92a2712e,
  title = {Geologic map of the Ophir quadrangle, San Juan, San Miguel, and Dolores Counties, Colorado},
  author = {Robert G. Luedke},
  year = {1996},
  doi = {10.3133/gq1760},
  url = {https://pubs.usgs.gov/publication/gq1760},
  note = {Source identifier: gq1760}
}