@misc{indiciaedfd55b1aa7f5,
  title = {Mercury content of the Springfield coal, Indiana and Kentucky},
  author = {J.C. Hower and Maria Mastalerz and A. Drobniak and J.C. Quick and C.F. Eble and M.J. Zimmerer},
  year = {2005},
  doi = {10.1016/j.coal.2005.03.018},
  url = {https://pubs.usgs.gov/publication/70028211},
  note = {Source identifier: 70028211}
}