@misc{indiciae4984f01dc97b,
  title = {Preliminary geologic map of the Calamity Ridge Quadrangle, Rio Blanco County, Colorado},
  author = {J. R. Donnell and W. J. Hail},
  year = {1984},
  doi = {10.3133/mf1690},
  url = {https://pubs.usgs.gov/publication/mf1690},
  note = {Source identifier: mf1690}
}