@misc{indiciae4037860035f4,
  title = {Mercury content and petrographic composition in Pennsylvanian coal beds of Indiana, USA},
  author = {Maria Mastalerz and A. Drobniak and G. Filippelli},
  year = {2006},
  doi = {10.1016/j.coal.2005.10.002},
  url = {https://pubs.usgs.gov/publication/70028161},
  note = {Source identifier: 70028161}
}