@misc{indiciae9b200411b336,
  title = {Aeroradioactivity map of Charlotte and vicinity, North Carolina},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1977},
  doi = {10.3133/ofr77722},
  url = {https://pubs.usgs.gov/publication/ofr77722},
  note = {Source identifier: ofr77722}
}