@misc{indiciae0f73479aec2e,
  title = {Mercury in U.S. coal; abundance, distribution, and modes of occurrence},
  author = {Susan J. Tewalt and Linda J. Bragg and Robert B. Finkelman},
  year = {2001},
  doi = {10.3133/fs09501},
  url = {https://pubs.usgs.gov/publication/fs09501},
  note = {Source identifier: fs09501}
}