@misc{indiciae6331768e35eb,
  title = {Quality of selected coal seams from Indiana: Implications for carbonization},
  author = {R. Walker and Maria Mastalerz and P. Padgett},
  year = {2001},
  doi = {10.1016/s0166-5162(01)00046-5},
  url = {https://pubs.usgs.gov/publication/70023030},
  note = {Source identifier: 70023030}
}