@misc{indiciaeedc6919b1123,
  title = {Aeromagnetic map of part of northern Virginia},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1977},
  doi = {10.3133/ofr77709},
  url = {https://pubs.usgs.gov/publication/ofr77709},
  note = {Source identifier: ofr77709}
}