@misc{indiciae75897240c53f,
  title = {Aeromagnetic map of the Ashfield quadrangle, Franklin and Hampshire Counties, Massachusetts},
  author = {J. L. Meuschke and G. L. Zandle},
  year = {1963},
  doi = {10.3133/gp429},
  url = {https://pubs.usgs.gov/publication/gp429},
  note = {Source identifier: gp429}
}