@misc{indiciaefef97a1fecf5,
  title = {Contour map of the bedrock surface, Hartford South Quadrangle, Connecticut},
  author = {R. B. Ryder and E. H. Handman},
  year = {1973},
  doi = {10.3133/mf487a},
  url = {https://pubs.usgs.gov/publication/mf487A},
  note = {Source identifier: mf487A}
}