@misc{indiciaee21a451b1eef,
  title = {Geochemical map of the Hunter-Fryingpan Wilderness Area and Porphyry Mountain Wilderness Study Area, Pitkin County, Colorado},
  author = {Steve Ludington and R. A. Yeoman},
  year = {1980},
  doi = {10.3133/mf1236b},
  url = {https://pubs.usgs.gov/publication/mf1236B},
  note = {Source identifier: mf1236B}
}