@misc{indiciae257e2e78e1b9,
  title = {Contour map of the bedrock surface, Wallingford Quadrangle, Connecticut},
  author = {F.P. Haeni},
  year = {1974},
  doi = {10.3133/mf554a},
  url = {https://pubs.usgs.gov/publication/mf554A},
  note = {Source identifier: mf554A}
}