@misc{indiciaebc2ff2090a00,
  title = {Aeromagnetic map of the South Canaan quadrangle and parts of the Cornwall and Ashley Falls quadrangles, Litchfield County, Connecticut},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1969},
  doi = {10.3133/gp641},
  url = {https://pubs.usgs.gov/publication/gp641},
  note = {Source identifier: gp641}
}