@misc{indiciaec554fa10e03c,
  title = {Geochemical map of the Piedra Wilderness study area, Archuleta and Hinsdale counties, Colorado},
  author = {K. J. Franczyk and S. M. Condon and A.L. Bush},
  year = {1985},
  doi = {10.3133/mf1630c},
  url = {https://pubs.usgs.gov/publication/mf1630C},
  note = {Source identifier: mf1630C}
}