@misc{indiciae4250149c40a9,
  title = {Geology of anthracite in the western part of the Ashland quadrangle, Pennsylvania},
  author = {Boyd R. Haley and Harold H. Arndt and Howard E. Rothrock and Holly C. Wagner},
  year = {1953},
  doi = {10.3133/coal13},
  url = {https://pubs.usgs.gov/publication/coal13},
  note = {Source identifier: coal13}
}