@misc{indiciae8b77f3cd315a,
  title = {Contour map of the bedrock surface of the Manchester quadrangle, Connecticut},
  author = {R. B. Colton and R.V. Cushman},
  year = {1963},
  doi = {10.3133/i402},
  url = {https://pubs.usgs.gov/publication/i402},
  note = {Source identifier: i402}
}