@misc{indiciae20dfac42a084,
  title = {Aeromagnetic map of the Springfield North quadrangle, Hampden and Hampshire Counties, Massachusetts},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1968},
  doi = {10.3133/gp618},
  url = {https://pubs.usgs.gov/publication/gp618},
  note = {Source identifier: gp618}
}