@misc{indiciaea08d115fabb5,
  title = {Aeromagnetic map of the Heath quadrangle, Franklin County, Massachusetts, and Windham County, Vermont},
  author = {Peter Popenoe and G. L. Zandle},
  year = {1963},
  doi = {10.3133/gp433},
  url = {https://pubs.usgs.gov/publication/gp433},
  note = {Source identifier: gp433}
}