@misc{indiciae47d7f7ea99da,
  title = {Coal systems analysis: A new approach to the understanding of coal formation, coal quality and environmental considerations, and coal as a source rock for hydrocarbons},
  author = {Peter D. Warwick},
  year = {2005},
  doi = {10.1130/0-8137-2387-6.1},
  url = {https://pubs.usgs.gov/publication/70035233},
  note = {Source identifier: 70035233}
}