@misc{indiciae212c035eb9f5,
  title = {Ore deposits in the vicinity of the London fault of Colorado},
  author = {Quentin Dreyer Singewald and Bert Sylvenus Butler},
  year = {1941},
  doi = {10.3133/b911},
  url = {https://pubs.usgs.gov/publication/b911},
  note = {Source identifier: b911}
}