@misc{indiciae707b565c797f,
  title = {The Little Sheep Mountain coal field, Dawson, Custer, and Rosebud Counties, Montana},
  author = {G. S. Rogers},
  year = {1913},
  doi = {10.3133/b531f},
  url = {https://pubs.usgs.gov/publication/b531F},
  note = {Source identifier: b531F}
}