@misc{indiciae696389f211b8,
  title = {Organic petrography of coals from a coalbed methane test well, Ouachita Parish, Louisiana},
  author = {Paul C. Hackley and Peter D. Warwick},
  year = {2005},
  doi = {10.3133/ofr20051134},
  url = {https://pubs.usgs.gov/publication/ofr20051134},
  note = {Source identifier: ofr20051134}
}