@misc{indiciae40eb48605bed,
  title = {Contour map of the bedrock surface, Branford Quadrangle, Connecticut},
  author = {C. Erwin Brown},
  year = {1974},
  doi = {10.3133/mf560c},
  url = {https://pubs.usgs.gov/publication/mf560C},
  note = {Source identifier: mf560C}
}