@misc{indiciaec262c2d3827d,
  title = {Aeromagnetic map of the Culpeper Basin and vicinity, Virginia and Maryland},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1981},
  doi = {10.3133/ofr81472},
  url = {https://pubs.usgs.gov/publication/ofr81472},
  note = {Source identifier: ofr81472}
}