@misc{indiciaefcad5fea6894,
  title = {Aeromagnetic map of the Beckett quadrangle, Berkshire, Hampshire, and Hampden Counties, Massachusetts},
  author = {Peter Popenoe and G. R. Boynton and G. L. Zandle},
  year = {1964},
  doi = {10.3133/gp448},
  url = {https://pubs.usgs.gov/publication/gp448},
  note = {Source identifier: gp448}
}