@misc{indiciaedb0e53d1ed21,
  title = {Geologic map of the Piedra Wilderness Study Area, Archuleta and Hinsdale counties, Colorado},
  author = {S. M. Condon and K. J. Franczyk and A.L. Bush},
  year = {1984},
  doi = {10.3133/mf1630b},
  url = {https://pubs.usgs.gov/publication/mf1630B},
  note = {Source identifier: mf1630B}
}