@misc{indiciae1f20a158d8d8,
  title = {Coal and petroleum resources in the Appalachian basin: index maps of included studies},
  author = {Leslie F. Ruppert and Michael H. Trippi and Scott A. Kinney},
  year = {2014},
  doi = {10.3133/pp1708b.1},
  url = {https://pubs.usgs.gov/publication/pp1708B.1},
  note = {Source identifier: pp1708B.1}
}