@misc{indiciaef632fc4025cf,
  title = {Aeromagnetic map of the South Boston Quadrangle, Halifax County, Virginia, and Person and Granville counties, North Carolina},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1971},
  doi = {10.3133/gp747},
  url = {https://pubs.usgs.gov/publication/gp747},
  note = {Source identifier: gp747}
}