@misc{indiciaeca504ac83b62,
  title = {Geology of anthracite in the southern part of the Trevorton quadrangle, Northumberland County, Pennsylvania},
  author = {Harold H. Arndt and Gordon H. Wood and Walter Danilchik},
  year = {1963},
  doi = {10.3133/coal48},
  url = {https://pubs.usgs.gov/publication/coal48},
  note = {Source identifier: coal48}
}