@misc{indiciaefaf41d34b0ea,
  title = {Assessment of Undiscovered Oil and Gas Resources of the Illinois Basin, 2007},
  author = {Christopher S. Swezey},
  year = {2007},
  doi = {10.3133/fs20073058},
  url = {https://pubs.usgs.gov/publication/fs20073058},
  note = {Source identifier: fs20073058}
}