@misc{indiciaefb37ea7cfdc3,
  title = {Chemistry of thermally altered high volatile bituminous coals from southern Indiana},
  author = {R. Walker and Maria Mastalerz and S. Brassell and E. Elswick and J.C. Hower and A. Schimmelmann},
  year = {2007},
  doi = {10.1016/j.coal.2006.06.009},
  url = {https://pubs.usgs.gov/publication/70030084},
  note = {Source identifier: 70030084}
}