@misc{indiciae8c2d8d5b31b7,
  title = {Contour map of the bedrock surface, Durham Quadrangle, Connecticut},
  author = {J.W. Bingham and F.D. Paine},
  year = {1976},
  doi = {10.3133/mf776a},
  url = {https://pubs.usgs.gov/publication/mf776A},
  note = {Source identifier: mf776A}
}