@misc{indiciaecc0c4f1d1bcb,
  title = {Geologic map of the Philadelphia Creek Quadrangle, Rio Blanco County, Colorado},
  author = {R. C. Johnson and M. C. Smith},
  year = {1993},
  doi = {10.3133/mf2216},
  url = {https://pubs.usgs.gov/publication/mf2216},
  note = {Source identifier: mf2216}
}