@misc{indiciaef9afd014c4c8,
  title = {Palynology, petrography and geochemistry of the Sewickley coal bed (Monongahela Group, Late Pennsylvanian), Northern Appalachian Basin, USA},
  author = {C.F. Eble and B.S. Pierce and W.C. Grady},
  year = {2003},
  doi = {10.1016/s0166-5162(03)00110-1},
  url = {https://pubs.usgs.gov/publication/70025433},
  note = {Source identifier: 70025433}
}