@misc{indiciae1bac96dcf13c,
  title = {Marine origin of pyritic sulfur in the Lower Bakerstown coal bed, Castleman coal field, Maryland (U.S.A.)},
  author = {P.C. Lyons and J. F. Whelan and F.T. Dulong},
  year = {1989},
  doi = {10.1016/0166-5162(89)90056-6},
  url = {https://pubs.usgs.gov/publication/70015533},
  note = {Source identifier: 70015533}
}