@misc{indiciae8ae7c82ab72e,
  title = {Bedrock geologic map of the Holliston and Medfield quadrangles, Middlesex, Norfolk, and Worcester counties, Massachusetts},
  author = {R.P. Volckmann},
  year = {1977},
  doi = {10.3133/i1053},
  url = {https://pubs.usgs.gov/publication/i1053},
  note = {Source identifier: i1053}
}