@misc{indiciae5c10de2c6020,
  title = {Preliminary report on the mineral resources of the Powderhorn Instant study area, Gunnison and Hinsdale counties, Colorado},
  author = {William N. Sharp and R.A. Martin and Michael Lane},
  year = {1980},
  doi = {10.3133/ofr801057},
  url = {https://pubs.usgs.gov/publication/ofr801057},
  note = {Source identifier: ofr801057}
}