@misc{indiciae3ac472ceb5c6,
  title = {Creation of digital databases and derivative products for coal and coalbed methane resource assessment; a short course},
  author = {Romeo M. Flores},
  year = {2000},
  doi = {10.3133/ofr00223},
  url = {https://pubs.usgs.gov/publication/ofr00223},
  note = {Source identifier: ofr00223}
}