@misc{indiciae4abe04ffbecf,
  title = {Facies development in the Lower Freeport coal bed, west-central Pennsylvania, U.S.A.},
  author = {B.S. Pierce and R.W. Stanton and C.F. Eble},
  year = {1991},
  doi = {10.1016/0166-5162(91)90042-h},
  url = {https://pubs.usgs.gov/publication/70016654},
  note = {Source identifier: 70016654}
}