@misc{indiciaea868feccc44a,
  title = {The Ekalaka lignite field, southeastern Montana},
  author = {C. M. Bauer},
  year = {1925},
  doi = {10.3133/b751f},
  url = {https://pubs.usgs.gov/publication/b751F},
  note = {Source identifier: b751F}
}