@misc{indiciae963ea8c39160,
  title = {The geochemistry of environmentally important trace elements in UK coals, with special reference to the Parkgate coal in the Yorkshire–Nottinghamshire Coalfield, UK},
  author = {D.A. Spears and S.J. Tewalt},
  year = {2009},
  doi = {10.1016/j.coal.2009.08.010},
  url = {https://pubs.usgs.gov/publication/70263569},
  note = {Source identifier: 70263569}
}