@misc{indiciaee17b5706ab57,
  title = {Contour map of the bedrock surface Broad Brook quadrangle, Connecticut},
  author = {R. B. Ryder},
  year = {1972},
  doi = {10.3133/mf451a},
  url = {https://pubs.usgs.gov/publication/mf451A},
  note = {Source identifier: mf451A}
}