@misc{indiciae658b31055b27,
  title = {Aeroradioactivity map of north-central North Carolina},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1977},
  doi = {10.3133/ofr77193},
  url = {https://pubs.usgs.gov/publication/ofr77193},
  note = {Source identifier: ofr77193}
}