@misc{indiciae945e6d042efa,
  title = {Geologic map of the Spar City quadrangle, Mineral County, Colorado},
  author = {Thomas August Steven and Peter W. Lipman},
  year = {1973},
  doi = {10.3133/gq1052},
  url = {https://pubs.usgs.gov/publication/gq1052},
  note = {Source identifier: gq1052}
}