@misc{indiciaeefa3cf3404b4,
  title = {Preliminary geologic map of the Anvil Points Quadrangle, Garfield County, Colorado},
  author = {R. B. O'Sullivan},
  year = {1986},
  doi = {10.3133/mf1882},
  url = {https://pubs.usgs.gov/publication/mf1882},
  note = {Source identifier: mf1882}
}