@misc{indiciae11402f819e40,
  title = {Preliminary bedrock geologic map of the Monson Quadrangle, Massachusetts and Connecticut},
  author = {J. D. Peper},
  year = {1974},
  doi = {10.3133/ofr74103},
  url = {https://pubs.usgs.gov/publication/ofr74103},
  note = {Source identifier: ofr74103}
}