@misc{indiciae7f7fe6810b71,
  title = {Coal south of Mancos, Montezuma County, Colo.},
  author = {A. J. Collier},
  year = {1919},
  doi = {10.3133/b691k},
  url = {https://pubs.usgs.gov/publication/b691K},
  note = {Source identifier: b691K}
}