@misc{indiciae7b4e9434f67e,
  title = {Aeromagnetic map of the Colchester quadrangle, New London, Middlesex, and Tolland Counties, Connecticut},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1973},
  doi = {10.3133/gp859},
  url = {https://pubs.usgs.gov/publication/gp859},
  note = {Source identifier: gp859}
}