@misc{indiciae375f8b573a0b,
  title = {Geologic map of anthracite-bearing rocks in the Tamaqua Quadrangle, Carbon and Schuylkill counties, Pennsylvania},
  author = {G.H. Wood},
  year = {1974},
  doi = {10.3133/i809},
  url = {https://pubs.usgs.gov/publication/i809},
  note = {Source identifier: i809}
}