@misc{indiciae4535d9377bbb,
  title = {Carboniferous formations and faunas of central Montana},
  author = {William Heyden Easton},
  year = {1962},
  doi = {10.3133/pp348},
  url = {https://pubs.usgs.gov/publication/pp348},
  note = {Source identifier: pp348}
}