@misc{indiciae0f2e4bb6171c,
  title = {Bibliography of U.S. Geological Survey publications relating to coal, 1882-1949},
  author = {Louise R. Berryhill},
  year = {1951},
  doi = {10.3133/cir86},
  url = {https://pubs.usgs.gov/publication/cir86},
  note = {Source identifier: cir86}
}