@misc{indiciaef557ad209af8,
  title = {Aeromagnetic map of the East Brookfield quadrangle, Worcester County, Massachusetts},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1968},
  doi = {10.3133/gp621},
  url = {https://pubs.usgs.gov/publication/gp621},
  note = {Source identifier: gp621}
}