@misc{indiciaedb7e643eff96,
  title = {Field trip guidebook; the anthracite basins of eastern Pennsylvania},
  author = {J.R. Levine and J.R. Eggleston},
  year = {1992},
  doi = {10.3133/ofr92568},
  url = {https://pubs.usgs.gov/publication/ofr92568},
  note = {Source identifier: ofr92568}
}