@misc{indiciaebe3abdbe9a69,
  title = {Piedmont folio, Maryland-West Virginia},
  author = {Nelson Horatio Darton and Joseph A. Taff},
  year = {1896},
  doi = {10.3133/gf28},
  url = {https://pubs.usgs.gov/publication/gf28},
  note = {Source identifier: gf28}
}