@misc{indiciae535857fef3ca,
  title = {Estimates of technically recoverable natural gas resources for continuous-type (unconventional) plays in coal beds on Federal lands of the conterminous United States},
  author = {R. A. Crovelli and V. F. Nuccio},
  year = {1997},
  doi = {10.3133/ofr97491},
  url = {https://pubs.usgs.gov/publication/ofr97491},
  note = {Source identifier: ofr97491}
}