@misc{indiciaea3d0c844eeb9,
  title = {Minerals of Colorado: A 100-year record},
  author = {Edwin Butt Eckel},
  year = {1961},
  doi = {10.3133/b1114},
  url = {https://pubs.usgs.gov/publication/b1114},
  note = {Source identifier: b1114}
}