@misc{indiciae65d636c4784e,
  title = {Contour map of the bedrock surface, Manchester quadrangle, Connecticut},
  author = {R. B. Ryder},
  year = {1972},
  doi = {10.3133/mf452a},
  url = {https://pubs.usgs.gov/publication/mf452A},
  note = {Source identifier: mf452A}
}