@misc{indiciaeae53a948bc29,
  title = {Contour map of the bedrock surface, Avon Quadrangle, Connecticut},
  author = {E. H. Handman and R. B. Ryder},
  year = {1973},
  doi = {10.3133/mf514a},
  url = {https://pubs.usgs.gov/publication/mf514A},
  note = {Source identifier: mf514A}
}