@misc{indiciaeb177110d6b40,
  title = {Mineral resource potential of the Piedra Wilderness Study Area, Archuleta and Hinsdale counties, Colorado},
  author = {Alfred L. Bush and Steven M. Condon and Karen J. Franczyk and S. Don Brown},
  year = {1983},
  doi = {10.3133/mf1630a},
  url = {https://pubs.usgs.gov/publication/mf1630A},
  note = {Source identifier: mf1630A}
}