@misc{indiciae719afae2bcbf,
  title = {Bedrock geologic map of the Monson quadrangle, Massachusetts and Connecticut},
  author = {John D. Peper},
  year = {1977},
  doi = {10.3133/gq1374},
  url = {https://pubs.usgs.gov/publication/gq1374},
  note = {Source identifier: gq1374}
}