@misc{indiciaebb76aac9ba7d,
  title = {Coal in the Tertiary lake beds of southwestern Montana},
  author = {J. T. Pardee},
  year = {1913},
  doi = {10.3133/b531g},
  url = {https://pubs.usgs.gov/publication/b531G},
  note = {Source identifier: b531G}
}