@misc{indiciaefa7517c4a568,
  title = {Aeromagnetic map of the Worcester South quadrangle, Worcester County, Massachusetts},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1968},
  doi = {10.3133/gp623},
  url = {https://pubs.usgs.gov/publication/gp623},
  note = {Source identifier: gp623}
}