@misc{indiciae648e641a8edd,
  title = {Preliminary geologic map of the Gypsum Gap quadrangle, Colorado},
  author = {F.W. Cater},
  year = {1954},
  doi = {10.3133/mf19},
  url = {https://pubs.usgs.gov/publication/mf19},
  note = {Source identifier: mf19}
}