@misc{indiciae91f07383075b,
  title = {Spatial trends in ash yield, sulfur, selenium, and other selected trace element concentrations in coal beds of the Appalachian Plateau region, U.S.A.},
  author = {Sandra G. Neuzil and Frank T. Dulong and C. Blaine Cecil},
  year = {2005},
  doi = {10.3133/ofr20051330},
  url = {https://pubs.usgs.gov/publication/ofr20051330},
  note = {Source identifier: ofr20051330}
}