@misc{indiciaeb85409fadbb8,
  title = {Estimates of technically recoverable petroleum resources for continuous-type (unconventional) plays in sandstones, shales, and chalks on Federal Lands of the conterminous United States},
  author = {R. A. Crovelli and J. W. Schmoker},
  year = {1997},
  doi = {10.3133/ofr97490},
  url = {https://pubs.usgs.gov/publication/ofr97490},
  note = {Source identifier: ofr97490}
}