@misc{indiciae0f6c5bf7781b,
  title = {Aeromagnetic map of the Southbridge quadrangle, Worcester County, Massachusetts, and Windham and Tolland Counties, Connecticut},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1968},
  doi = {10.3133/gp631},
  url = {https://pubs.usgs.gov/publication/gp631},
  note = {Source identifier: gp631}
}