@misc{indiciae8ea4cbf85227,
  title = {Geology and mineral deposits of the Poncha Springs SE Quadrangle, Chaffee County, Colorado},
  author = {Ralph Erskine Van Alstine},
  year = {1974},
  doi = {10.3133/pp829},
  url = {https://pubs.usgs.gov/publication/pp829},
  note = {Source identifier: pp829}
}