@misc{indiciae911ccbc9b8a1,
  title = {Aeromagnetic map of the Peru quadrangle, Berkshire and Hampshire Counties, Massachusetts},
  author = {Peter Popenoe and G. R. Boynton and G. L. Zandle},
  year = {1964},
  doi = {10.3133/gp455},
  url = {https://pubs.usgs.gov/publication/gp455},
  note = {Source identifier: gp455}
}