@misc{indiciae9fb7551a3841,
  title = {Geology of Precambrian rocks, Central City district, Colorado},
  author = {P.K. Sims and D. J. Gable},
  year = {1964},
  doi = {10.3133/pp474c},
  url = {https://pubs.usgs.gov/publication/pp474C},
  note = {Source identifier: pp474C}
}