@misc{indiciae6c7fa053d20d,
  title = {Natural gamma aeroradioactivity map of the Bangor quadrangle, New Jersey and Pennsylvania},
  author = {G. R. Boynton and D.R. Pittillo and G. L. Zandle},
  year = {1966},
  doi = {10.3133/gp568},
  url = {https://pubs.usgs.gov/publication/gp568},
  note = {Source identifier: gp568}
}