@misc{indiciae20df9deb36fb,
  title = {Bedrock geologic map of the West Springfield quadrangle, Massachusetts and Connecticut},
  author = {Roger B. Colton and Joseph H. Hartshorn},
  year = {1966},
  doi = {10.3133/gq537},
  url = {https://pubs.usgs.gov/publication/gq537},
  note = {Source identifier: gq537}
}