@misc{indiciae8e5a8018913b,
  title = {Contour map of the bedrock surface of the Broad Brook quadrangle, Connecticut},
  author = {R.V. Cushman and R. B. Colton},
  year = {1963},
  doi = {10.3133/i401},
  url = {https://pubs.usgs.gov/publication/i401},
  note = {Source identifier: i401}
}