@misc{indiciae42ad5c890144,
  title = {Geology of the pitchblende ores of Colorado},
  author = {Edson S. Bastin},
  year = {1915},
  doi = {10.3133/pp90a},
  url = {https://pubs.usgs.gov/publication/pp90A},
  note = {Source identifier: pp90A}
}