@misc{indiciaea521c7aa17e5,
  title = {Geology of anthracite in the eastern part of the Shamokin quadrangle, Northumberland County, Pennsylvania},
  author = {Walter Danilchik and Harold H. Arndt and Gordon H. Wood},
  year = {1962},
  doi = {10.3133/coal46},
  url = {https://pubs.usgs.gov/publication/coal46},
  note = {Source identifier: coal46}
}