@misc{indiciae46c121bf22c3,
  title = {Appalachian basin bituminous coal: Weight percent sulfur of produced coal by county, as received at the power plant},
  author = {Emil Attanasi and Robert C. Milici},
  year = {1998},
  doi = {10.3133/ofr98763},
  url = {https://pubs.usgs.gov/publication/ofr98763},
  note = {Source identifier: ofr98763}
}