@misc{indiciae450af5460b52,
  title = {Preliminary geologic map of the Grand Valley Quadrangle, Garfield County, Colorado},
  author = {J. R. Donnell and W. E. Yeend and M. C. Smith},
  year = {1986},
  doi = {10.3133/mf1883},
  url = {https://pubs.usgs.gov/publication/mf1883},
  note = {Source identifier: mf1883}
}