@misc{indiciaecb696858d287,
  title = {Preliminary report on the geology of the Coalmont district, Jackson County, Colorado},
  author = {C. E. Erdmann},
  year = {1941},
  doi = {10.3133/ofr442},
  url = {https://pubs.usgs.gov/publication/ofr442},
  note = {Source identifier: ofr442}
}