@misc{indiciae40615457837e,
  title = {Economic analysis for U.S. Geological Survey Coal Basin Assessments},
  author = {Paul E. Pierce},
  year = {2019},
  doi = {10.3133/ofr20191082},
  url = {https://pubs.usgs.gov/publication/ofr20191082},
  note = {Source identifier: ofr20191082}
}