@misc{indiciae9a5d91dc31ba,
  title = {Preliminary materials map of the Great Barrington quadrangle, Massachusetts},
  author = {George William Holmes},
  year = {1964},
  doi = {10.3133/ofr6481},
  url = {https://pubs.usgs.gov/publication/ofr6481},
  note = {Source identifier: ofr6481}
}