@misc{indiciaee6adee708e04,
  title = {Functional group and individual maceral chemistry of high volatile bituminous coals from southern Indiana: Controls on coking},
  author = {R. Walker and Maria Mastalerz},
  year = {2004},
  doi = {10.1016/j.coal.2003.10.008},
  url = {https://pubs.usgs.gov/publication/70027278},
  note = {Source identifier: 70027278}
}