@misc{indiciae4411c30ed861,
  title = {Bibliography of selected reports on USGS international coal-related activities},
  author = {John R. SanFilipo and Peter D. Warwick},
  year = {1998},
  doi = {10.3133/ofr98350},
  url = {https://pubs.usgs.gov/publication/ofr98350},
  note = {Source identifier: ofr98350}
}