@misc{indiciae4d1e9262bb2b,
  title = {Contour map of the bedrock surface, Ellington quadrangle, Connecticut},
  author = {Elinor H. Handman and Robert B. Ryder},
  year = {1974},
  doi = {10.3133/mf604a},
  url = {https://pubs.usgs.gov/publication/mf604A},
  note = {Source identifier: mf604A}
}