@misc{indiciae24caa2010865,
  title = {Paper coal in Indiana},
  author = {G.K. Guennel and R.C. Neavel},
  year = {1959},
  doi = {10.1126/science.129.3364.1671},
  url = {https://pubs.usgs.gov/publication/70010732},
  note = {Source identifier: 70010732}
}