@misc{indiciaebe2807c1221f,
  title = {Preliminary bedrock geologic map of the Aspen and nearby areas, Virginia},
  author = {Arthur E. Nelson},
  year = {1993},
  doi = {10.3133/ofr92725},
  url = {https://pubs.usgs.gov/publication/ofr92725},
  note = {Source identifier: ofr92725}
}