@misc{indiciaef289d091d1a3,
  title = {Aeromagnetic map of the Hamburg quadrangle, New London and Middlesex Counties, Connecticut},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1973},
  doi = {10.3133/gp869},
  url = {https://pubs.usgs.gov/publication/gp869},
  note = {Source identifier: gp869}
}