@misc{indiciaeeabd10fb6d3a,
  title = {Aeromagnetic map of the Palmer quadrangle, Hampden, Hampshire, and Worcester Counties, Massachusetts},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1968},
  doi = {10.3133/gp617},
  url = {https://pubs.usgs.gov/publication/gp617},
  note = {Source identifier: gp617}
}