@misc{indiciae30753e974d8a,
  title = {Stable isotope geochemistry of sphalerite and other mineral matter in coal beds of the Illinois and Forest City basins},
  author = {J. F. Whelan and J.C. Cobb and R. O. Rye},
  year = {1988},
  doi = {10.2113/gsecongeo.83.5.990},
  url = {https://pubs.usgs.gov/publication/70014447},
  note = {Source identifier: 70014447}
}