@misc{indiciae641ff703665e,
  title = {Geology of the west-central part of the Southern Anthracite field and adjoining areas, Pennsylvania},
  author = {Gordon H. Wood and J. Peter Trexler and Thomas M. Kehn},
  year = {1969},
  doi = {10.3133/pp602},
  url = {https://pubs.usgs.gov/publication/pp602},
  note = {Source identifier: pp602}
}