@misc{indiciae331d7cc7dd8f,
  title = {Appalachian basin bituminous coal: sulfur content and potential sulfur dioxide emissions of coal mined for electrical power generation},
  author = {Michael H. Trippi and Leslie F. Ruppert and Emil Attanasi and Robert C. Milici and P.A. Freeman},
  year = {2014},
  doi = {10.3133/pp1708g.5},
  url = {https://pubs.usgs.gov/publication/pp1708G.5},
  note = {Source identifier: pp1708G.5}
}