@misc{indiciae275565d56647,
  title = {Map showing depth to bedrock, Avon Quadrangle, Connecticut},
  author = {E. H. Handman and R. W. Schnabel},
  year = {1973},
  doi = {10.3133/mf514b},
  url = {https://pubs.usgs.gov/publication/mf514B},
  note = {Source identifier: mf514B}
}