@misc{indiciae6638536cd082,
  title = {Geology of anthracite in the west-central part of the Mount Carmel quadrangle, Pennsylvania},
  author = {Howard Eugene Rothrock and Holly Clyde Wagner and Boyd Raymond Haley},
  year = {1950},
  doi = {10.3133/coal3},
  url = {https://pubs.usgs.gov/publication/coal3},
  note = {Source identifier: coal3}
}