@misc{indiciaef242c68e0efd,
  title = {Aeromagnetic map of parts of the Piney River and Shipman quadrangles, Amherst and Nelson Counties, Virginia},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1969},
  doi = {10.3133/ofr69293},
  url = {https://pubs.usgs.gov/publication/ofr69293},
  note = {Source identifier: ofr69293}
}