@misc{indiciaece16ffe0b0f4,
  title = {Geological maps of anthracite-bearing rocks in the west-central part of the southern anthracite field, Pennsylvania, eastern area},
  author = {Gordon H. Wood and Peter Trexler and Thomas M. Kehn},
  year = {1968},
  doi = {10.3133/i528},
  url = {https://pubs.usgs.gov/publication/i528},
  note = {Source identifier: i528}
}