@misc{indiciaee822ef405b5f,
  title = {Natural gamma aeroradioactivity map of parts of the Lambertville, Lumberville, and Stockton quadrangles, New Jersey and Pennsylvania},
  author = {G. R. Boynton and D.R. Pettillo and G. L. Zandle},
  year = {1966},
  doi = {10.3133/gp572},
  url = {https://pubs.usgs.gov/publication/gp572},
  note = {Source identifier: gp572}
}