@misc{indiciae5f7de31720c6,
  title = {Contour map of the bedrock surface, Guilford Quadrangle, Connecticut},
  author = {F.P. Haeni},
  year = {1974},
  doi = {10.3133/mf583a},
  url = {https://pubs.usgs.gov/publication/mf583A},
  note = {Source identifier: mf583A}
}