@misc{indiciaefe973cbe8ff1,
  title = {Contour map of the bedrock surface, Essex quadrangle, Connecticut},
  author = {R. G. Naylor},
  year = {1974},
  doi = {10.3133/mf587c},
  url = {https://pubs.usgs.gov/publication/mf587C},
  note = {Source identifier: mf587C}
}