@misc{indiciae54c238714e8f,
  title = {Aeromagnetic map of the Northfield quadrangle, Franklin County, Massachusetts, Windham County, Vermont, and Cheshire County, New Hampshire},
  author = {G. E. Andreasen and G. L. Zandle},
  year = {1963},
  doi = {10.3133/gp435},
  url = {https://pubs.usgs.gov/publication/gp435},
  note = {Source identifier: gp435}
}