@misc{indiciae253aef8d2af1,
  title = {Contour map of the bedrock surface, Middletown Quadrangle, Connecticut},
  author = {J.W. Bingham},
  year = {1976},
  doi = {10.3133/mf639b},
  url = {https://pubs.usgs.gov/publication/mf639B},
  note = {Source identifier: mf639B}
}