@misc{indiciae90784e32f8c9,
  title = {Contour map of the bedrock surface, Glastonbury Quadrangle, Connecticut},
  author = {R. B. Ryder and E. H. Handman},
  year = {1974},
  doi = {10.3133/mf561b},
  url = {https://pubs.usgs.gov/publication/mf561B},
  note = {Source identifier: mf561B}
}