@misc{indiciae5c7f5638be42,
  title = {Contour map of the bedrock surface, New London Quadrangle, Connecticut},
  author = {F.P. Haeni and R.L. Melvin},
  year = {1974},
  doi = {10.3133/ofr74254},
  url = {https://pubs.usgs.gov/publication/ofr74254},
  note = {Source identifier: ofr74254}
}