@misc{indiciae16ba10601a3d,
  title = {Analyses of lignites and associated rocks from the Fort Union region, North Dakota and Montana},
  author = {Susan J. Tewalt and Ricky T. Hildebrand and Robert B. Finkelman},
  year = {1989},
  doi = {10.3133/ofr89285},
  url = {https://pubs.usgs.gov/publication/ofr89285},
  note = {Source identifier: ofr89285}
}