@misc{indiciaec3938ec6c20c,
  title = {Reconnaissance bedrock geologic map of the Marlborough quadrangle, Massachusetts},
  author = {Patrick James Barosh},
  year = {1978},
  doi = {10.3133/ofr78221},
  url = {https://pubs.usgs.gov/publication/ofr78221},
  note = {Source identifier: ofr78221}
}