@misc{indiciae31d390625672,
  title = {Organic geochemical study of sequences overlying coal seams; example from the Mansfield Formation (Lower Pennsylvanian), Indiana},
  author = {Maria Mastalerz and A.B. Stankiewicz and G. Salmon and E.P. Kvale and C.L. Millard},
  year = {1997},
  doi = {10.1016/s0166-5162(96)00053-5},
  url = {https://pubs.usgs.gov/publication/70019628},
  note = {Source identifier: 70019628}
}