@misc{indiciaeb55c454089b5,
  title = {Preliminary reconnaissance bedrock geologic map of the Shrewsbury quadrangle, Worcester County, Massachusetts},
  author = {J. Christopher Hepburn},
  year = {1978},
  doi = {10.3133/ofr78951},
  url = {https://pubs.usgs.gov/publication/ofr78951},
  note = {Source identifier: ofr78951}
}