@misc{indiciae3db184cfdef7,
  title = {Database of the United States Coal Pellet Collection of the U.S. Geological Survey Organic Petrology Laboratory},
  author = {Nikolaus J. Deems and Paul C. Hackley},
  year = {2012},
  doi = {10.3133/ofr20121151},
  url = {https://pubs.usgs.gov/publication/ofr20121151},
  note = {Source identifier: ofr20121151}
}