@misc{indiciae58bcc378ba85,
  title = {Natural gamma aeroradioactivity map of the Belvidere quadrangle, New Jersey and Pennsylvania},
  author = {G. R. Boynton and D.R. Pittillo and G. L. Zandle},
  year = {1966},
  doi = {10.3133/gp569},
  url = {https://pubs.usgs.gov/publication/gp569},
  note = {Source identifier: gp569}
}