@misc{indiciaef93987a67197,
  title = {Aeromagnetic map of the Danville Quadrangle, Pittsylvania County, Virginia, and Caswell County, North Carolina},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1971},
  doi = {10.3133/gp745},
  url = {https://pubs.usgs.gov/publication/gp745},
  note = {Source identifier: gp745}
}