@misc{indiciae1a0bab3f99d4,
  title = {Geologic map of the Poncha Springs Quadrangle, Chaffee County, Colorado},
  author = {G. R. Scott and R. E. Van Alstine and W. N. Sharp},
  year = {1975},
  doi = {10.3133/mf658},
  url = {https://pubs.usgs.gov/publication/mf658},
  note = {Source identifier: mf658}
}