@misc{indiciae07f337ad44ef,
  title = {Geology and mineral deposits of the Poncha Springs NE quadrangle, Chaffee County, Colorado},
  author = {Ralph Erskine Van Alstine and D. C. Cox},
  year = {1969},
  doi = {10.3133/pp626},
  url = {https://pubs.usgs.gov/publication/pp626},
  note = {Source identifier: pp626}
}