@misc{indiciae065c1768a13c,
  title = {Sulfur variability and petrology of the Lower Block Coal Member (Pennsylvanian) in Southwest Indiana},
  author = {P.L. Padgett and S.M. Rimmer and J.C. Ferm and J.C. Hower and C.F. Eble and Maria Mastalerz},
  year = {1999},
  doi = {10.1016/s0166-5162(98)00041-x},
  url = {https://pubs.usgs.gov/publication/70021792},
  note = {Source identifier: 70021792}
}