@misc{indiciae58a4d32519f8,
  title = {Geology of anthracite in the western part of the Delano quadrangle, Pennsylvania},
  author = {John Alfred Maxwell and Howard Eugene Rothrock},
  year = {1955},
  doi = {10.3133/coal25},
  url = {https://pubs.usgs.gov/publication/coal25},
  note = {Source identifier: coal25}
}